"Lift with your legs" isn't what the evidence saysStrong evidence
Training workers in a lifting technique, with or without lifting aids, didn't prevent back pain: none of 9 trials in 20,101 workers showed a preventive effect, and in the 7 that could be combined, back pain was similar with training as without it (moderate-quality evidence). A review of lab studies found no biomechanical case for squatting to protect the back: the pressure in the discs was similar either way, and the estimated load on the low back was the same or somewhat higher when squatting, unless the load could be lifted from between the feet.
The Health and Safety Executive (HSE) itself says "slight bending of your back, hips and knees at the start of the lift is preferable to either fully flexing your back (stooping) or fully flexing your hips and knees (full/deep squatting)", with the load close to your waist and no twisting. It adds that good technique "is not a substitute" for lifting aids or a change to the task.
Sources 19, 20, 4, 21
Exercise has the best evidenceStrong evidence
In a review of 249 trials, exercise reduced long-lasting low back pain by about 15 points out of 100 at the first follow-up, compared with no treatment, usual care or placebo, on moderate-certainty evidence, though the gain in day-to-day function was small (about 7 points); side effects were mostly minor, such as sore muscles. To stop it coming back, exercise with education roughly halved the chance of a new episode, while education alone, back belts and shoe insoles didn't help. In 701 people who had recovered, a walking programme with education nearly doubled the time to the next episode (a median of 208 days against 112). NICE says consider a group exercise programme.
Sources 22, 17, 18, 15
Use the direction that eases itEmerging evidence
In a trial of 312 people with back pain, the 74% who had a direction that eased their pain did better with exercises in that direction than with the opposite direction or general exercise. A review found such a direction in about 70% of people with back or neck pain, across 5 studies. If bending forward eases your back, the knee to chest suits it; if arching back eases it, the press-up does. You don't need both.
Sources 12, 13
Rebuilding confidence in bendingEmerging evidence
In a trial of 492 people with disabling back pain for more than 3 months, cognitive functional therapy, an individual physiotherapy approach that works on unhelpful thoughts, feelings and habits around pain (up to 7 sessions over 12 weeks), improved activity limits by 4.6 points on a 24-point scale against usual care, and the benefit lasted a year. Earlier gains in confidence, and falls in fear, worry and pain, explained up to 61% of the effect on activity limits.
No trial has tested a bending programme on its own, so this plan's steps, from unloaded bending to lifting, are our suggestion, built on that trial and the exercise trials.
Sources 23, 24
How heavy and how often: the HSE's guidance, used at homeEmerging evidence
The HSE's guideline weights for lifting at work are highest around waist height and lowest near the floor: for men, 20 to 25 kg close to the body between mid-lower-leg and elbow height, against 10 kg below mid-lower-leg height; for women, 13 to 16 kg against 7 kg. Its checklist asks whether lifting from floor level can be avoided, whether twisting and stooping can be reduced, and whether the work can be varied so one set of muscles rests while another works.
These are risk filters for work, not safe limits, and not targets for someone in pain. Using them at home, with lighter, closer loads and fewer repeats while your back is sore, is our suggestion.
Sources 25, 21, 7
Bending with osteoporosisStrong evidence
The Royal Osteoporosis Society says "bending forward is generally safe and won't cause a spinal fracture. But you may 'over-flex' your spine if you push yourself to the limit", especially with "uncontrolled, repetitive or sudden movements" or a load on a curved spine. Its rule is to "think straight": keep your upper back straight and your neck in line, move slowly and smoothly within a comfortable range, and twist only if it's smooth and comfortable.
Its factsheet calls the cat (cat-cow) "a safe exercise to do with osteoporosis", and suggests a roll-down against a wall or a hamstring stretch instead of touching your toes, and a plank instead of sit-ups. The bending pages are past their review date and marked as being updated.
Sources 26, 27, 28, 14
Belts and supports: NICE says don'tStrong evidence
NICE says don't offer belts or corsets for low back pain. In prevention trials, back belts didn't lower the chance of an episode, though that evidence is low quality. Strength and walking are what lowered the chance of the next episode.
Sources 17, 15