The guidelines
Strength work for all your major muscles on at least 2 days a week, plus 150 minutes of moderate activity spread through the week. Any strength work is better than none.
Training guide
How many days a week should you work out?
Strength training on at least 2 days a week for all your major muscles, plus about 150 minutes of brisk activity spread through the week, meets the guidelines. Even once or twice a week is far better than none, and one session a week keeps the strength you have built.
For building muscle, the number of hard sets you do each week matters more than how you spread them: train each muscle once, twice or three times a week and you grow about the same, so pick the schedule you can keep. This guide covers the guidelines, how often to train each muscle, full body versus splits, the minimum that works, and plans from 2 to 7 days.
The short version
Once or twice a week still helps
The NHS says exercising just once or twice a week can reduce the risk of heart disease or stroke. The UK's 2026 evidence review supports 1 to 2 strength sessions a week.
For muscle, weekly sets matter more than days
With the same weekly sets, training a muscle once, twice or three times a week built similar muscle, and full-body and split routines matched too.
For strength, practice helps
Training a lift more often builds more strength, mostly because it adds sets, with smaller returns as you add days.
The minimum that works
About 4 hard sets per muscle a week, or one hard set per exercise 2 to 3 times a week. Three 13-minute sessions a week raised strength as much as far longer ones in one trial.
Keeping what you've built
One session a week, with the weights kept heavy, kept strength for months in younger adults. Older adults may need two to keep their muscle.
What the guidelines say
Strength: at least 2 days a week
The NHS and the World Health Organization (WHO) ask adults to work all the major muscle groups (legs, hips, back, tummy, chest, shoulders and arms) on at least 2 days a week, to the point where you need a short rest before repeating. The UK Chief Medical Officers say strength work matters as much as the 150 minutes of aerobic activity.
Aerobic: 150 minutes, spread out
WHO advises 150 to 300 minutes of moderate activity or 75 to 150 minutes of vigorous activity a week. The NHS suggests spreading it over 4 to 5 days, or every day. Strength work can be on the same days or different ones.
Any is better than none
The UK Chief Medical Officers: "any strengthening activity is better than none". Their 2026 evidence review adds that the evidence supports strength sessions 1 to 2 times a week, with measurable health benefits from about 30 up to 120 minutes a week, and that the 150 minutes of aerobic activity still helps when done in 1 or 2 sessions.
From 65
WHO asks older adults for varied activity that builds balance and strength on 3 or more days a week, to help prevent falls. Our guide for older adults has the detail.
Source 1
What the evidence says
For muscle, weekly sets matter more than daysStrong evidence
In 25 studies, training a muscle once, twice or three or more times a week built similar muscle when the weekly sets were the same. The largest analysis since, of 67 studies, found the effect of frequency on growth was small enough to be negligible, and the American College of Sports Medicine (ACSM) found the same comparing 1 day with more than 5.
Twice beat once in an early analysisMixed evidence
A 2016 analysis of 10 studies found training each muscle twice a week grew it more than once. The larger 2019 analysis found no meaningful difference with the weekly sets matched. Twice a week is still a practical default, because it makes enough weekly sets easier to fit in.
Practice helps strengthEmerging evidence
In 22 studies, strength gains rose from training a lift once a week to 4 or more times, but not when the weekly sets were matched. In the largest analysis, strength rose by about 3% for each extra weekly session, with diminishing returns (preprint figures).
Full body or split: similar resultsStrong evidence
In 14 studies with 392 people, split routines and full-body routines gave similar strength and muscle gains when the weekly sets matched. Choose by your schedule and what you enjoy.
Source 5
A little strength training goes a long way for healthEmerging evidence
People who did muscle-strengthening activity had a 10 to 17% lower risk of early death, heart disease, cancer and diabetes in 16 cohort studies, with the biggest drop at about 30 to 60 minutes a week. In 147,374 adults followed for up to 30 years, 90 to 119 minutes a week was linked with 13% lower mortality, with no extra benefit above about 120 minutes. These studies show a link, not proof of cause.
Weekend warriorsEmerging evidence
In 18 publications, people who did their 150 minutes in 1 or 2 days had a similar drop in mortality to those who spread it out (24% against 29% lower risk than inactive people). These are observational studies; the NHS still suggests spreading activity through the week.
Minimum doses build strengthEmerging evidence
In trained men, one hard set of 6 to 12 reps, 2 to 3 times a week, raised squat and bench-press strength. In 34 trained men, three 13-minute sessions a week gave strength gains similar to far longer ones, though more sets built more muscle. Once-weekly single sets raised strength by about 30 to 50% in a year in 14,690 gym members. Short, frequent bursts (exercise snacks) improve strength and function too.
Maintaining is easier than buildingEmerging evidence
Strength, and muscle size in younger adults, held for up to 32 weeks on one session a week with 1 set per exercise, as long as the weights stayed heavy. In a 70-person trial, a third or a ninth of the original training kept muscle size in adults aged 20 to 35 but not 60 to 75, and strength was largely kept even after stopping.
How often to train each muscle
A practical default
Each muscle about twice a week, at whatever schedule you can keep (our plans' default). Twice a week spreads your sets so no single session gets too long.
By experience
The 2009 ACSM position stand suggested 2 to 3 days a week for beginners, 3 to 4 once you have trained for about 6 months, and 4 to 5 for advanced lifters. The 2026 stand notes the beginner advice rested on 3 small studies, and favours fitting the plan to you.
Full body, upper and lower, or push, pull and legs
All work when the weekly sets match. With full body or upper and lower days, each muscle comes round about twice a week, so a missed session costs less than in a split that trains each muscle once (our suggestion).
Source 5
How long should a workout be?
As long as your sets take: about 20 minutes for two supersets, and 35 to 55 minutes for our full plans. In trained men, three 13-minute sessions a week raised strength as much as longer ones, and supersets cut session time without losing gains.
Can I work out every day?
Moving every day is good. Lifting hard every day isn't needed, because weekly sets matter more than days. Our rest days guide and 7-day plan show how to mix easy and hard days.
The minimum that works, and how to keep it
The floor for muscle
About 4 hard sets per muscle a week, with weights you can lift 6 to 15 times, built around a squat or leg press, an upper-body pull and an upper-body push. In the largest analysis, 4 weekly sets was the smallest dose with measurable growth (preprint figures).
The floor for strength
One hard set per exercise, 1 to 3 times a week, builds strength, even in trained people. It's slower than more sets, but far better than none.
Exercise snacks
Brief, frequent bursts, such as a minute of sit-to-stands or a flight of stairs a few times a day, improve strength and function and break up sitting. Our 3-minute desk movement break is one way to start.
Keeping what you've built
In busy weeks, one session with your usual heavy weights keeps your strength. Older adults may need two sessions a week, with 2 to 3 sets per exercise, to keep their muscle.
Our 20-minute session
Two supersets: goblet squats with dumbbell rows, then Romanian deadlifts with push-ups, twice through. Done twice a week it gives each movement 4 hard sets (our editorial session, built on these reviews).
Short sessions
The 20-minute workout is the minimum dose for busy weeks. The 10-minute starter and desk break suit low-energy days and long days at a desk; the full-body workouts take 35 to 50 minutes.
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 box
10-minute starter workout
A 10-minute session for low-energy days: marching, sit-to-stands, wall push-ups, step-ups and bridges, then a short walk. Doing a little counts.
10 minBeginner7 movesA bench or box, A wall
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
Full-body dumbbell workout
A 35-minute full-body strength workout with dumbbells: goblet squats, presses, rows, Romanian deadlifts and carries.
35 minIntermediate9 movesA band, A dumbbell
Full-body gym workout A
A beginner full-body gym workout: goblet squats, dumbbell bench press, lat pulldowns, Romanian deadlifts and dead bugs, with sets, reps and rest.
45 minBeginner12 movesCardio machine, A bandMinimum-dose moves and exercise snacks
For the minimum dose, do 2 hard sets of 8 to 12 of a squat, a pull, a push and a hinge, twice a week. For exercise snacks, 40 seconds of sit-to-stands or calf raises, or 8 wall push-ups, a few times a day (as in our desk break and starter workout), and take the stairs when you can.
3D demoDumbbell goblet squatIntermediate · A dumbbell
3D demoLeg pressBeginner · Strength machine
3D demoSupported single-arm dumbbell rowIntermediate · A dumbbell + A bench or box
3D demoPush-upIntermediate · No equipment
3D demoDumbbell Romanian deadliftIntermediate · A dumbbell
3D demoSit to stand from a chairBeginner · A bench or box
3D demoWall push-upBeginner · A wall
3D demoSlow calf raiseBeginner · A wall
3D demoStair climbingIntermediate · A stepPlans by days a week
From 2 to 7 days. Each plan page shows how many hard sets per muscle a week it gives, so you can see what an extra day buys.
2 days a week
2-day full-body workout plan
Two full-body strength sessions a week: the minimum that meets health guidelines, with every set, rep and rest, and an 8-week progression.
2 training days45 minBeginner2 days a weekBeginner workout plan: your first 4 weeks
Your first four weeks: two, then three short strength sessions a week at home plus walks, building gently to a full routine.
2 training days20 minBeginner3 days a week3-day full-body workout plan
A beginner gym plan: three full-body sessions a week, alternating workouts A and B, with sets, reps, rest and an 8-week progression.
3 training days45 minBeginner3 days a week3-day home workout plan
Three full-body home workouts a week with dumbbells or no equipment at all, plus walks and an 8-week plan to keep progressing.
3 training days35 minBeginner4 days a week4-day upper/lower workout split
A 4-day upper/lower split: two upper body and two lower body gym days, each muscle trained twice a week, with sets, reps and progression.
4 training days50 minIntermediate5 days a week5-day workout split
A 5-day gym split that trains every muscle twice a week: upper, lower, push, pull and legs, with an honest look at the bro split.
5 training days50 minIntermediate5 days a week5-day body-part split (bro split)
The classic chest, back, legs, shoulders and arms week, built from our gym workouts, with what research says about training each muscle once.
5 training days45 minIntermediate6 days a weekPush pull legs split (6 days a week)
A 6-day push/pull/legs plan for experienced lifters: two push, two pull and two leg days, with sets, reps, rest and lighter weeks.
6 training days55 minAdvanced7 days a week7-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 minBeginnerWarning signs, and who should check first
Check with a GP first
If you haven't exercised for some time, or have a medical condition or concerns (NHS). Medical clearance is generally unnecessary before light or moderate activity otherwise, but anyone who develops new symptoms as they do more should see a doctor (WHO).
Call 999 now (911 in the US)
Stop and call 999 for:
- Chest pain that feels tight, heavy or like squeezing, or spreads to your arms, neck, jaw, stomach or back.
- Chest pain with sweating, feeling sick, light-headedness or breathlessness.
- Someone fainting while exercising.
Training more than you recover from
Falling performance for a week or two, with tiredness, poor sleep or low mood, is a sign to drop to fewer or lighter sessions for a week (our suggestion). If it doesn't lift, see a GP.
Myths
"You need to work out every day"Strong evidence
The strength guideline is 2 or more days a week, and for muscle your weekly sets matter more than how many days you spread them over. Move every day if you like; lift hard on 2 to 4.
"Each muscle must be trained exactly once (or three times) a week"Strong evidence
With the weekly sets matched, frequency hardly changed growth. Choose what fits your week.
"Once a week is pointless"Emerging evidence
Once-weekly single sets raised strength by about 30 to 50% in a year, and the UK's evidence review supports 1 to 2 strength sessions a week. More builds more, but one is far better than none.
"Miss a week and you lose everything"Emerging evidence
Strength was largely kept for months after stopping, and one session a week maintained it. Pick up where you left off, or a little lighter.
Read next
Questions people ask
How many days a week should I work out?
At least 2 days of strength training for all your major muscles, plus 150 minutes of moderate activity spread through the week. For building muscle, 2 to 4 strength days suit most people.
Is working out 2 days a week enough?
For health, yes: it meets the strength guideline. For muscle, more weekly sets build more, so 3 or 4 days builds faster, but two hard full-body sessions bring real gains.
Is once a week enough to build strength?
It's much better than none: once-weekly single sets raised strength by about 30 to 50% in a year in one large study. The UK's evidence review supports 1 to 2 strength sessions a week, and one session also keeps the strength you've built.
How often should you train each muscle group?
Twice a week is a sensible default, but with the same weekly sets, once or three times a week grows muscle about the same. Practising a lift more often helps strength.
Is full body or a split better?
Neither: they give similar strength and muscle gains when the weekly sets match. Choose by your schedule. With a full-body plan, a missed day costs less.
Can I work out every day?
Moving every day is good, but lifting hard every day isn't needed. Mix strength days with walks, cardio or rest; our rest days guide and 7-day plan show how.
How long should a workout be?
As long as your sets take: about 20 minutes for a two-superset session, 35 to 55 minutes for our full plans. In trained men, three 13-minute sessions a week raised strength as much as much longer ones.
What is the minimum effective dose of strength training?
About 4 hard sets per muscle a week, or one hard set per exercise 2 to 3 times a week. Short, frequent exercise snacks also improve strength and function.
How much training do I need to keep my strength?
One session a week, with the weights kept heavy, kept strength and, in younger adults, muscle for up to 32 weeks. Older adults may need two sessions a week to keep their muscle.
Is it OK to do all my exercise at the weekend?
In observational studies, people who fitted their 150 minutes into 1 or 2 days had similar health benefits to those who spread it out. Spreading it through the week is still the NHS advice, and it makes each session shorter.
How often should older adults work out?
Balance and strength work on 3 or more days a week, plus 150 minutes of moderate activity, as WHO advises. Our guide for older adults has the detail.
Sources
- Bull 2020 · World Health Organization 2020 guidelines on physical activity and sedentary behaviour (BJSM)
- UK Chief Medical Officers 2019 · Physical activity guidelines (updated July 2026, with the 2026 evidence review, GOV.UK)
- NHS · Physical activity guidelines for adults aged 19 to 64
- Schoenfeld 2019 · How many times a week to train a muscle for growth: 25 studies (meta-analysis, J Sports Sci)
- Ramos-Campo 2024 · Split vs full-body resistance training for strength and muscle growth: 14 studies (meta-analysis, JSCR)
- Pelland 2026 · The resistance training dose response: weekly volume and frequency, muscle growth and strength, 67 studies (meta-regressions, Sports Medicine)
- Grgic 2018 · Training frequency and muscle strength: 22 studies (meta-analysis, Sports Medicine)
- Iversen 2021 · No time to lift? Designing time-efficient training for strength and muscle (narrative review, Sports Medicine)
- Androulakis-Korakakis 2020 · The minimum effective training dose for one-rep max strength in trained men (meta-analysis, Sports Medicine)
- Schoenfeld 2019 · 1, 3 or 5 sets per exercise: muscle growth and strength in 34 trained men (RCT, MSSE)
- Spiering 2021 · The minimal dose of exercise needed to maintain endurance and strength (narrative review, JSCR)
- Bickel 2011 · Exercise dosing to keep strength training gains in young and older adults (RCT, MSSE)
- Currier 2026 · Resistance training for muscle function, size and performance in healthy adults: 137 reviews (ACSM position stand, MSSE)
- Schoenfeld 2016 · Training frequency and muscle growth: 10 studies (meta-analysis, Sports Medicine)
- Pelland 2024 · The resistance training dose-response: weekly volume and frequency (preprint of the 2026 paper, SportRxiv; not peer reviewed)
- Momma 2022 · Muscle-strengthening activity and the risk of disease and death: 16 cohort studies (meta-analysis, BJSM)
- Zhang 2026 · Long-term resistance training and mortality in 147,374 adults (cohort study, BJSM)
- Kim 2025 · The weekend warrior pattern and health outcomes: 18 publications (systematic review and meta-analysis, Public Health)
- Steele 2023 · Strength over up to 6.8 years of once-weekly minimal-dose training in 14,690 adults (retrospective cohort, Research Quarterly for Exercise and Sport)
- Fyfe 2022 · Minimal-dose resistance training for muscle mass, strength and function (narrative review, Sports Medicine)
- ACSM 2009 · Progression models in resistance training for healthy adults (position stand, MSSE)
- Zhang 2025 · Supersets vs traditional sets: 19 studies (systematic review and meta-analysis, Sports Medicine)
- Brummer 2026 · Meeting the WHO strength guideline does not have to be time-consuming (perspective, Frontiers in Public Health)
- NHS · Heart attack: symptoms
- NHS · Fainting
- NHS · Chest pain
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.