The best time is the one you'll keep
For strength and muscle, morning and evening training gave similar gains across 11 studies, and a review of 26 studies found no single best time of day.
Training guide
The best time to work out: morning or evening, fasted or fed, and why the best time is the one you'll keep
Morning or evening? For building strength and muscle, the trials say it barely matters: people gained about the same whichever time they trained. You're often a little stronger and quicker later in the day, but your body adapts to the time you train, so the best time to exercise is the one you'll keep.
Timing does matter for a few things. A short walk after a meal lowers the rise in blood sugar, which helps most if you have type 2 diabetes. Fasted cardio burns a little more fat during the session, but not more fat overall. In trials, evening exercise didn't harm sleep as long as hard sessions ended more than about an hour before bed, though the NHS's advice for insomnia is to stop 4 hours before.
This guide covers morning against evening for strength, muscle and performance, eating before exercise, blood sugar and walking after meals, sleep, weight and blood pressure, and who should plan their timing with care.
The short version
You may be a little stronger later in the day
Short all-out efforts tend to peak between about 4pm and 8pm, but training in the morning makes you better at performing in the morning.
Fasted cardio burns a little more fat during the session, not more fat overall
About 3 g more fat per session, but the same fat loss over 4 weeks on the same diet.
For blood sugar, move after you eat
In type 2 diabetes, a 10-minute walk after each main meal lowered blood sugar after meals more than one 30-minute walk a day, most of all after the evening meal.
Evening exercise is usually fine for sleep
In trials, evening sessions didn't harm sleep as long as hard ones ended more than about an hour before bed. The NHS's advice for insomnia is no exercise in the 4 hours before bed: if you sleep badly, follow it.
For weight and blood pressure, no time has been shown to be better
The findings rest on single small trials and one analysis in which people chose their own times. Your total activity matters far more.
Your body clock, food and the time of day
Performance has a daily rhythm
Most people are a little stronger in the evening than in the morning, and short all-out efforts such as sprints and jumps tend to peak between about 4pm and 8pm. The morning dip is smaller after a good warm-up, in warm surroundings, and in people who regularly train in the morning.
Your body adapts to the time you train
Over weeks, strength and muscle gains were similar whichever time people trained, and people got best at the time of day they trained.
What "fasted" means
In studies, fasted usually means after an overnight fast, before breakfast. On an empty stomach your body burns a little more fat and a little less carbohydrate during the session: a change of fuel, not extra fat loss over the weeks.
Blood sugar after meals
Blood sugar rises after you eat, often most after the evening meal. Working muscles take up sugar from the blood, so moving soon after a meal blunts the rise.
Exercise and sleep
The NHS says regular exercise can help you sleep better, though some people find that exercising close to bedtime affects their sleep. If it does, be active earlier in the day.
What the evidence says
Morning or evening: similar gainsStrong evidence
Across 11 studies of moderate to good quality, gains in strength and muscle size were similar whether people trained in the morning or the evening. Most people were stronger in the evening at the start, and morning training brought their morning strength up to their evening level.
Source 1
No single best timeEmerging evidence
A review of 26 studies found little evidence for or against any time of day for performance or health, some evidence of bigger gains when training and testing happen at the same time of day, and a high risk of bias in most of the studies.
Source 2
Single trials of muscle growthEmerging evidence
After 10 weeks of morning or afternoon strength training, thigh muscle grew 2.7% and 3.5%, not a significant difference. In 42 young men doing strength and endurance training for 24 weeks, morning and evening groups gained similar strength and fitness, and the evening groups gained a little more muscle in the second 12 weeks.
Fasted exercise burns a little more fat during the sessionStrong evidence
Across 27 studies of 273 people, aerobic exercise on an empty stomach burned about 3 g more fat during the session than exercise after a meal.
Source 4
But not more fat over the weeksEmerging evidence
In 20 young women eating the same reduced calories for 4 weeks, an hour of cardio 3 times a week took off the same fat whether they did it fasted or fed. It's one small trial.
Source 5
Eating first helps longer sessionsEmerging evidence
Across 46 studies, eating before exercise improved performance in longer aerobic sessions, but not in shorter efforts.
Source 18
Lifting gains were the same fasted or fedEmerging evidence
In 28 young adults lifting twice a week for 12 weeks, gains in muscle, strength and power were similar whether they trained after an overnight fast or 1 to 2 hours after a carbohydrate meal.
Source 19
Walking after meals lowers blood sugarEmerging evidence
In 41 adults with type 2 diabetes, advice to walk for 10 minutes after each main meal lowered blood sugar after meals by 12% compared with one 30-minute walk a day, and by 22% after the evening meal. In 10 older adults at risk of diabetes, three 15-minute walks after meals controlled blood sugar over 24 hours as well as one 45-minute walk, and better after the evening meal.
Light walking breaks during long spells of sitting lowered blood sugar after meals more than standing breaks did, and across 19 trials (346 people) with type 2 diabetes, exercise after meals improved blood sugar more consistently than exercise before them, mostly from comparisons between studies.
The ACSM's consensusStrong evidence
The American College of Sports Medicine's 2022 consensus on type 2 diabetes says most studies show exercise after meals controls blood sugar better, with sessions of 45 minutes or more giving the most consistent effect.
Source 21
Morning or afternoon with type 2 diabetesMixed evidence
In 11 men with type 2 diabetes, 2 weeks of morning high-intensity intervals raised their average blood sugar and afternoon sessions lowered it. In 24 adults with type 2 diabetes, a single morning session raised blood sugar for the next 2 hours and an afternoon one didn't, but blood sugar over 24 hours didn't differ. Over 12 weeks in 40 adults, morning and evening training improved blood sugar alike.
Evening exercise and sleepEmerging evidence
Across 23 studies, evening exercise didn't harm sleep; vigorous exercise ending within about an hour of bedtime was the exception, and may delay and shorten sleep. In 15 studies, hard evening sessions ending 2 to 4 hours before bed didn't disrupt sleep. In tracker data from 14,689 active people, later and harder sessions went with later, shorter and poorer sleep, but sessions ending at least 4 hours before sleep weren't linked with any change; that's observational.
Newer evidence agrees. A 2026 review that pooled 16 trials found no clear overall advantage for morning or evening exercise for sleep; evening or night sessions went with a little more waking in the night, which small studies may have exaggerated. In the only trial of yoga timing, 156 students' sleep improved about as much with morning as with evening classes, though about half of them dropped out. The advice on this page stands.
Weight and blood pressure: no reliable winnerMixed evidence
These findings rest on single small trials and one analysis in which people chose their own times. In a 10-month supervised exercise trial, people who did most sessions before noon lost 7.2% of their weight, against 2.1% for those who exercised between 3pm and 7pm, but they weren't put into those groups at random.
In 56 trained adults over 12 weeks, morning exercise reduced belly fat and blood pressure more in the women, and evening exercise lowered blood pressure more in the men. In 50 men with treated high blood pressure, 10 weeks of evening cycling lowered blood pressure and morning cycling didn't, while a review of 5 studies found benefits at both times.
Long-term health: the cohorts disagreeMixed evidence
In 92,139 UK adults wearing activity trackers, moderate to vigorous activity at any time of day went with lower death rates, and activity at midday to afternoon, or spread across the day, went with lower risk than morning activity. In 29,836 UK adults with obesity, evening activity went with the lowest death rates. Both are observational, and they point in different directions.
Keeping to one timeMixed evidence
Exercising at a consistent time, especially in the morning, may help people with obesity keep going. It's an idea that trials haven't tested yet.
Source 31
Morning or evening: what to do
Train when you can keep it up
Gains were similar at either time, so pick the slot that suits your work, family, energy and sleep, and keep it.
If you compete or test at a set time
Train at that time some of the time: people got best at the time of day they trained.
Early sessions: warm up a little longer
Short all-out efforts are weaker in the morning, and an active warm-up is one of the things that narrows the gap. Our warm-up guide has a 10-minute routine.
Source 3
Make it a habit
Training on the same days at the same time helps it become automatic, as our guide to starting working out explains. A regular morning slot may help some people keep going, though that hasn't been tested in trials.
Source 31
Fasted or fed
Choose by comfort
For fat loss and for lifting gains it doesn't seem to matter whether you eat first, so do what suits you. Our weight loss guide covers what does matter for fat loss.
When to eat first
Eat something before long or hard sessions, if you feel faint or weak training on an empty stomach, in pregnancy (the NHS says not to exercise on an empty stomach), and if you take a diabetes medicine that can cause hypos.
Not straight after a big meal
A big meal just before hard exercise can bring on a stitch or reflux, so leave a couple of hours after a large meal before a hard session, as our start running and acid reflux guides suggest. A gentle walk after a meal is fine.
Blood sugar: move after you eat
A 10-minute walk after meals
Start soon after you finish eating and walk for about 10 minutes, especially after your largest meal: the dose from a trial in type 2 diabetes. Our 10-minute walk and move after meals has standing moves for when you can't get out.
Break up long spells of sitting
Short breaks of light walking during long spells of sitting lowered blood sugar after meals more than standing up did.
Source 7
If you take insulin or a sulfonylurea
Hypos (low blood sugar) with exercise are mainly a risk if you take insulin or a sulfonylurea such as gliclazide. Agree the timing of exercise, meals and doses with your diabetes team, check your blood sugar as they advise, and carry something sugary.
Hard morning sessions can raise blood sugar for a while
Morning interval sessions raised blood sugar for a few hours in people with type 2 diabetes, though blood sugar over 24 hours didn't differ in the larger study. Our type 2 diabetes guide covers this.
Exercise and sleep
If you sleep well
Exercise when it suits you. In trials, evening exercise didn't harm sleep as long as hard sessions ended more than about an hour before bed.
If you sleep badly
Follow the NHS's advice for insomnia: exercise regularly during the day, and don't exercise in the 4 hours before bed. Our sleep guide covers exercise for sleep problems.
Source 9
If a late session keeps you awake
Move it earlier, or keep late sessions easy. In tracker data, sessions that ended at least 4 hours before sleep weren't linked with any change in sleep.
Winding down
Gentle stretching and slow breathing before bed count as relaxing rather than exercise, as our sleep guide explains.
How to choose your time
Our editorial checklist, built on the evidence on this page.
- Look at your week: when could you train 2 to 4 times, every week?
- Match it to your goal: train at your event or test time some of the time, or soon after a meal if blood sugar is the aim.
- Check your sleep: if a late session keeps you awake, move it earlier or keep it easy, and with insomnia finish at least 4 hours before bed.
- Eat to suit the session: have something first before long or hard sessions, in pregnancy, or if you take insulin or a sulfonylurea.
- Warm up a little longer if you train early.
- Keep it consistent: the same days and the same time make it a habit.
Moves for after a meal
The moves in our 10-minute walk and move after meals: walk first, or do these standing moves if you can't get out, starting soon after you finish eating.
Workouts for any time of day
A walk and move after meals for blood sugar, short breaks for long spells of sitting, gentle morning and bedtime routines, and easy cardio and strength sessions you can fit in whenever suits you.
10-minute walk and move after meals
A 10-minute routine for straight after a meal: an easy walk, a few simple standing moves from blood sugar trials, then a short walk to finish.
10 minBeginner6 movesCardio machine, A bench or box
3-minute desk movement break
A 3-minute standing break to repeat every 30 to 60 minutes at your desk: sit-to-stands, calf raises, marching, an upper-back turn and chin tucks.
3 minBeginner5 movesA bench or box, A wall
10-minute morning stretch
A gentle, no-equipment stretch routine to wake up the spine, hips and shoulders in ten minutes.
10 minBeginner10 movesNo equipment
Bedtime stretch routine
A slow, 10-minute floor routine to unwind before sleep: child's pose, twists, happy baby and slow breathing.
10 minBeginner7 movesFirm cushion, A wall
Breathing exercises to relax
A 6-minute breathing routine: slow breathing, crocodile breathing, alternate nostril breathing, box breathing and 4-7-8 breathing.
6 minBeginner5 movesNo equipment
Easy cardio workout
A steady 30 to 45 minute cardio session at talk-but-not-sing pace: walk, cycle, row or cross-train, counting toward weekly activity guidelines.
40 minBeginner3 movesCardio machine, A wall
20-minute full-body strength workout
A 20-minute full-body dumbbell workout: two supersets of squats, rows, Romanian deadlifts and push-ups. Twice a week covers the minimum dose.
20 minBeginner8 movesA dumbbell, A bench or boxPlans
Both are easy to fit at any time of day.
7 days a week
7-day workout plan
A full week that mixes intensities: three strength days, two cardio days, a mobility day and an easy day, never seven hard days.
3 training days45 minBeginner6 days a weekWalking plan for beginners: 8 weeks to 150 minutes a week
A free 8-week walking plan for beginners: build to 150 minutes of brisk walking a week, with intervals, hills and two short strength sessions.
6 training days40 minBeginnerDiabetes, pregnancy, sleep problems and other situations
Type 2 diabetes
Walk after meals, keep up your weekly exercise, and plan timing with your diabetes team if you take insulin or a sulfonylurea. Our type 2 diabetes guide has the detail.
Pregnancy
The NHS says not to exercise on an empty stomach. Our pregnancy guide adds avoiding hard exercise in hot, humid weather or the midday sun.
Source 32
Insomnia
Exercise in the day, ideally in the morning or afternoon, and don't exercise in the 4 hours before bed.
Source 9
Low blood pressure on standing
Dizziness when you stand up, for example with Parkinson's, tends to be worse after a meal, in the heat and in the morning, as our Parkinson's guide explains, so take extra care at those times.
Reflux or a hernia
Our acid reflux and hernia guides suggest leaving a couple of hours after a meal before a hard session or heavy lifting. A gentle stroll after a meal is fine.
High blood pressure
One session lowers blood pressure for hours afterwards, so wait at least 30 minutes after exercise before you measure it, as our blood pressure guide explains.
Shift work
There's little research to go on. Pick a regular slot that fits your rota and keep hard sessions away from the hour or so before your main sleep (our suggestion).
Source 8
Warning signs: when to get help
Call 999 (911 in the US)
For chest pain that comes on suddenly and doesn't go away, or spreads to your arms, neck, jaw, stomach or back; severe difficulty breathing; or someone who faints while exercising. Call 999 too if someone with very low blood sugar isn't responding normally or is unconscious, and glucagon isn't available, hasn't worked within 10 minutes, or they've been drinking alcohol. During any session, stop for chest pain or pressure, unusual breathlessness, dizziness or fainting.
Signs of a hypo
Low blood sugar can make you feel hungry, dizzy, anxious or irritable, sweaty, shaky, tired or weak, with tingling lips, palpitations, blurred vision or confusion. If you have diabetes and your blood sugar is below 4 mmol/L, or you have these signs, treat it straight away with something sugary, as the NHS sets out. See a GP if hypos are frequent or severe, or happen at night.
Source 33
Sleep problems
See a GP if changing your sleeping habits hasn't helped, you've had trouble sleeping for months, or it's affecting your daily life in a way that makes it hard to cope.
Source 9
Pregnancy
Don't exercise on an empty stomach. Our pregnancy guide lists the signs to stop and call your midwife or maternity unit.
Source 32
Myths
"You can't build muscle training in the morning (or the evening)"Strong evidence
Across 11 studies, morning and evening training gave similar gains in strength and muscle size, and a review of 26 studies found no time of day clearly better.
"Fasted cardio burns more fat, so you'll lose more"Emerging evidence
Exercising on an empty stomach burned about 3 g more fat during the session across 27 studies, but in a 4-week trial in 20 women on the same diet, the fasted and fed groups lost the same fat. What you eat over the day and the week decides fat loss.
"Evening exercise ruins your sleep"Emerging evidence
Across 23 studies, evening exercise didn't harm sleep, and only hard exercise ending within about an hour of bedtime looked likely to delay it. Hard sessions ending 2 to 4 hours before bed didn't disrupt sleep across 15 studies. With insomnia, though, the NHS says to avoid exercise in the 4 hours before bed.
"Morning exercise boosts your metabolism all day"
None of the time-of-day trials in this guide found a lasting boost. The extra energy you use after a session is small, whenever you train, as our HIIT guide explains.
"There's one best time for everyone"Strong evidence
Trials and reviews find no single best time, and large cohort studies disagree about which time goes with the lowest death rates. The time you'll keep is the best time.
Read next
Questions people ask
What is the best time of day to work out?
The one you'll keep. For strength and muscle, morning and evening training gave similar gains across 11 studies, and a review of 26 studies found no single best time for health or performance.
Is it better to work out in the morning or at night?
Both work. Most people are a little stronger and quicker in the late afternoon and evening, but people who train in the morning get better at performing in the morning. Choose by your schedule, your energy and your sleep.
Does fasted cardio burn more fat?
It burns a little more fat during the session, about 3 g on average across 27 studies, but in a 4-week trial in 20 women on the same diet, fasted and fed exercise took off the same fat. If you feel faint or weak training on an empty stomach, eat first.
Should I eat before a workout?
For shorter sessions it's up to you: lifting twice a week built similar muscle and strength fasted or fed in a 12-week trial, while eating beforehand helped longer aerobic sessions. A big meal just before hard exercise can bring on a stitch or reflux, so leave a couple of hours after a large meal. In pregnancy, the NHS says not to exercise on an empty stomach.
Is it bad to work out before bed?
Usually not: in trials, evening exercise didn't harm sleep as long as hard sessions ended more than about an hour before bed. But the NHS's advice for insomnia is to avoid exercise in the 4 hours before bed, so if you sleep badly, follow that, and if a late session keeps you awake, move it earlier.
When is the best time to exercise for blood sugar?
After eating: in adults with type 2 diabetes, a 10-minute walk after each main meal lowered blood sugar after meals more than one 30-minute walk a day, especially after the evening meal. If you take insulin or a sulfonylurea such as gliclazide, more exercise can bring on a hypo, so agree the timing with your diabetes team.
What's the best time to work out to lose weight?
Whatever time you'll keep doing. In one analysis, people who mostly exercised in the morning lost more weight over 10 months than those who exercised in the late afternoon, but they chose their own times and other studies disagree. Your total activity and what you eat matter far more.
What's the best time to work out to build muscle?
Any time you can train regularly: gains were similar across 11 studies. In one 24-week trial in 42 young men, evening training added a little more muscle in the second 12 weeks, which is too small and uncertain to plan around.
What's the best time to exercise to lower blood pressure?
Both morning and evening exercise went with lower blood pressure in a small review of 5 studies, and in 50 men with treated high blood pressure, evening cycling lowered it more than morning cycling. Exercise when you can; our blood pressure guide has the rest.
Should women work out in the morning and men in the evening?
One 12-week trial in 56 trained adults found that morning exercise trimmed more belly fat and blood pressure in the women, while evening exercise lowered the men's blood pressure more. It's one small trial, so don't plan your week around it.
Do I need a longer warm-up in the morning?
It helps if you're doing short, all-out efforts: they tend to peak between about 4pm and 8pm, and an active warm-up is one of the things that narrows the morning gap. Our warm-up guide has a 10-minute routine.
I work shifts. When should I exercise?
There's little research to go on, so pick a regular slot that fits your rota and keep hard sessions away from the hour or so before your main sleep. Keeping the time as consistent as you can may help it become a habit.
Sources
- Grgic 2019 · Morning or evening strength training and gains in strength and muscle: 11 studies (systematic review and meta-analysis, Chronobiol Int)
- Bruggisser 2023 · The best time of day for exercise training: 26 studies (systematic review and meta-analysis, Sports Med Open)
- Mirizio 2020 · Time of day and short all-out exercise performance (narrative review, Sci Rep)
- Vieira 2016 · Aerobic exercise fasted or fed and the fuel burned: 27 studies (systematic review and meta-analysis, Br J Nutr)
- Schoenfeld 2014 · Body composition changes with fasted vs fed aerobic exercise in 20 women (randomised trial, JISSN)
- Reynolds 2016 · Walking after meals vs walking at any time in type 2 diabetes (randomised crossover study, Diabetologia)
- Buffey 2022 · Interrupting sitting with standing or light walking: effects on blood sugar after meals (meta-analysis, Sports Medicine)
- Stutz 2019 · Evening exercise and sleep in healthy people: 23 studies (systematic review and meta-analysis, Sports Medicine)
- NHS · Insomnia
- Willis 2020 · Exercise timing and weight loss over 10 months in a supervised exercise trial (secondary analysis, Int J Obes)
- Arciero 2022 · Morning or evening exercise for 12 weeks in 56 trained women and men (randomised trial, Front Physiol)
- Brito 2019 · Morning or evening aerobic training and blood pressure in 50 men with treated high blood pressure (randomised trial, MSSE)
- Keiser 2024 · Time of day for eating, exercise and sleep and blood pressure in adults with raised blood pressure (systematic review, J Hypertens)
- DiPietro 2013 · Three 15-minute walks after meals against one 45-minute walk in 10 older adults at risk (crossover trial, Diabetes Care)
- NHS Every Mind Matters · How to fall asleep faster and sleep better
- Sedliak 2009 · Morning or afternoon strength training and muscle growth over 10 weeks in men (trial, JSCR)
- Küüsmaa 2016 · Morning or evening combined strength and endurance training for 24 weeks in 42 young men (trial, Appl Physiol Nutr Metab)
- Aird 2018 · Fasted or fed exercise and performance: 46 studies (systematic review and meta-analysis, Scand J Med Sci Sports)
- Vieira 2025 · Resistance training after an overnight fast or after a meal for 12 weeks in 28 young adults (randomised trial, Int J Sport Nutr Exerc Metab)
- Teo 2018 · Exercise timing in type 2 diabetes (systematic review, MSSE)
- Kanaley 2022 · Exercise and physical activity in type 2 diabetes (ACSM consensus statement, MSSE)
- Savikj 2019 · Afternoon vs morning interval training and blood sugar in type 2 diabetes (crossover trial, Diabetologia)
- Keller 2025 · Blood sugar after morning vs afternoon exercise in type 2 diabetes (crossover trial, Diabetologia)
- Teo 2020 · Morning or evening exercise for 12 weeks and blood sugar control in 40 adults (randomised trial, MSSE)
- Frimpong 2021 · Evening high-intensity exercise and sleep: 15 studies (meta-analysis, Sleep Medicine Reviews)
- Leota 2025 · Evening exercise and sleep in 14,689 people wearing activity trackers (observational study, Nature Communications)
- Souabni 2026 · Morning or evening exercise and sleep: 25 studies, 16 trials pooled (systematic review and meta-analysis, Sleep Med Rev)
- Iyer 2026 · Morning or evening yoga for sleep, mood and wellbeing: 156 students (Dawn vs Dusk randomised trial, J Ayurveda Integr Med)
- Feng 2023 · Timing of physical activity and death rates in 92,139 UK adults wearing trackers (cohort study, Nat Commun)
- Sabag 2024 · Timing of physical activity and death rates in 29,836 UK adults with obesity (cohort study, Diabetes Care)
- Schumacher 2020 · Consistent morning exercise may help people with obesity (hypothesis paper, Exerc Sport Sci Rev)
- NHS · Exercise in pregnancy
- NHS · Low blood sugar (hypoglycaemia) (past its review date: reviewed August 2023, review due August 2026)
- NHS · Chest pain (past its review date: reviewed August 2023, review due August 2026)
- NHS · Shortness of breath
- NHS · Fainting
Exercise education, not a personal prescription, and clinical review of these guides is pending. Check with a GP before starting hard training if you have a heart condition, chest pain, dizziness or breathlessness when active, and stop for sharp or increasing pain. Health disclaimer.