About building muscle

What it is, why it happens and what helps. Contents:

• How muscles grow
• Why strength training matters
• How much you need
• Getting started
• Progressive overload
• Heavy or light weights?
• Food and protein
• Rest, sleep and recovery
• The mind-muscle connection
• Exercise motivation
• Making it a habit
• Strength for the mind
• Building muscle at any age
• Training at home
• How self-help methods fit in
• When to get support
• FAQs

How muscles grow

When you challenge a muscle with more than it is used to, such as lifting a weight or doing a push-up, it responds by adapting. Over the following days, your body repairs and strengthens the muscle fibres, especially when you eat enough and rest well. Repeat this over weeks and months, and muscles become stronger and larger. Scientists call muscle growth hypertrophy. You can explore related topics in our Health hub.

Early on, much of your strength gain comes from your nervous system learning to use your muscles more efficiently. That is why beginners often get stronger quickly, which is very motivating.

Why strength training matters

The World Health Organization says that muscle-strengthening activity benefits everyone, and that doing some physical activity is better than doing none. [5] The benefits go far beyond looks:

• Longer, healthier life. A meta-analysis found that muscle-strengthening activity was linked to a 10% to 17% lower risk of death from any cause, heart disease, cancer and diabetes. [6]
• Better mood. A meta-analysis of 33 trials found resistance training reduced symptoms of depression. [7]
• Less anxiety. Another meta-analysis found resistance training reduced anxiety. [8]
• Everyday strength. Carrying shopping, climbing stairs and playing with children all get easier.
• Bones and balance. Strength training supports bones and joints and helps with balance as you age.

How much you need

The NHS recommends that adults do strengthening activities that work all the major muscle groups (legs, hips, back, abdomen, chest, shoulders and arms) on at least two days a week, alongside at least 150 minutes of moderate activity a week. [9] The meta-analysis by Momma and colleagues found the greatest benefits with around 30 to 60 minutes of muscle-strengthening activity a week. [6] That could be two or three sessions of 20 to 30 minutes. It doesn’t need to take over your life.

Getting started

You don’t need a gym. The NHS lists body-weight exercises, resistance bands, yoga and pilates, as well as weights, as ways to build strength. [9] A simple beginner session:

1. Warm up for five minutes, such as brisk walking or marching on the spot.
2. Squats (or sit-to-stands from a chair): 2 sets of 8 to 12.
3. Push-ups (against a wall, a table or on your knees): 2 sets of 8 to 12.
4. Rows with a resistance band or a backpack: 2 sets of 8 to 12.
5. Glute bridges: 2 sets of 10 to 15.
6. Plank: 2 holds of 15 to 30 seconds.
7. Cool down with gentle stretches.

Choose a level where the last few reps feel challenging but your form stays good. Do this twice a week, and add a little each week. If you are new to exercise, have a health condition or an injury, check with your doctor first.

Progressive overload

To keep improving, muscles need a gradually increasing challenge. This is called progressive overload. You can add reps, add sets, add weight, slow the movement down or try a harder version of an exercise. A meta-analysis by Brad Schoenfeld and colleagues found that doing more sets each week led to more muscle growth. [2] Increase slowly, and let your body adapt. A simple training log helps you see progress and know when to step up.

Heavy or light weights?

Good news if heavy weights put you off: a meta-analysis found that light and heavy loads built similar amounts of muscle when sets were taken close to failure (the point where you can’t do another good rep). Heavier weights were better for building maximum strength. [10] So you can choose what suits you, whether that is dumbbells, machines, bands or your own body weight. What matters most is effort and consistency.

Food and protein

Muscles need fuel and building blocks. Eat regular, balanced meals with plenty of vegetables, fruit, whole grains and protein. A meta-analysis of 49 trials found that extra protein helped people gain strength and muscle during resistance training, with the benefit levelling off at around 1.6 grams of protein per kilogram of body weight per day. [4] Most people can get this from everyday foods such as eggs, dairy, fish, meat, beans, lentils, tofu and nuts. If you have a health condition, talk to your doctor or a dietitian before making big changes to your diet. If you are also working on your weight, our guide to weight loss has more.

Rest, sleep and recovery

Muscles grow while you rest, not while you train. Leave a day or two between sessions for the same muscle group. Aim for good sleep every night, as sleep supports recovery and energy. Our guide to sleep has tips. Some muscle soreness a day or two after a new workout is normal and usually eases quickly. Sharp pain is a signal to stop and get it checked.

The mind-muscle connection

What you focus on while training may matter. In a study by Brad Schoenfeld and colleagues, people who focused on the muscle they were working (thinking “squeeze the biceps”) gained more arm muscle thickness than those who focused only on moving the weight: 12.4% compared with 6.9%. [3] Your mind can even build strength on its own to some degree. In a classic study by Guang Yue and Kelly Cole, people who only imagined strong finger contractions increased their finger strength by 22%, compared with 30% for those who did real training. [1] Mental rehearsal is no replacement for real training, but it shows how closely mind and muscle are linked, and visualisation can be a helpful extra.

Exercise motivation

Knowing what to do is the easy part. Doing it week after week is where most people struggle. These tools help:

• Find your why. Write down why you want to get stronger: to keep up with your children, feel confident, stay independent as you age, manage stress. Read it when motivation dips.
• Make if-then plans. “If it is Tuesday at 7am, then I do my workout before breakfast.” A meta-analysis of 94 tests found plans like this had a medium-to-large effect on reaching goals. [11]
• Use WOOP. Name your Wish, picture the Outcome, spot your inner Obstacle and make a Plan. A meta-analysis found it helps people reach goals. [12]
• Set specific goals. “Do 10 full push-ups by March” beats “get fit”. [13]
• Track progress. Seeing numbers go up is powerful motivation.
• Be kind to yourself. If you miss a week, start again without guilt. Self-compassion supports motivation to improve. [14]

Our guide to motivation has much more on this.

Making it a habit

A study by Phillippa Lally and colleagues found that new habits took a median of 66 days to become automatic, and that missing a day here and there did not undo progress. [15] To make training stick:

• Same time, same place. Link training to an existing routine.
• Make it easy. Lay out your kit the night before.
• Start small. A short session done beats a long session skipped.
• Never miss twice. One missed session is fine. Get back on track at the next one.
• Enjoy it. Play music you love, train with a friend or try a class.

Strength for the mind

Many people start strength training for their bodies and stay for their minds. Meta-analyses have found resistance training reduces symptoms of depression [7] and anxiety. [8] Getting stronger also builds a sense of capability that often spills into other areas of life. In her TED talk, neuroscientist Wendy Suzuki describes the brain-boosting benefits of exercise. If you are working on mood or stress, see our guides to depression, anxiety and stress management.

Building muscle at any age

It is never too late to get stronger. People in their 60s, 70s, 80s and beyond can build muscle and strength with regular training. For older adults, strength and balance work helps with everyday tasks and staying independent. Start gently, focus on good form and build gradually. Chair-based exercises, resistance bands and classes for older adults are good places to begin. Your doctor can advise if you have any health concerns.

Training at home

Home training is free, flexible and removes many barriers. With your body weight, a resistance band and perhaps a pair of dumbbells, you can work every major muscle group. Follow-along videos make it easy to start; there are a couple in Videos. As you get stronger, try harder versions of exercises, such as moving from wall push-ups to floor push-ups, or from two-leg to single-leg squats.

How self-help methods fit in

Mind-based methods can help you start and stay consistent. Visualisation helps you rehearse sessions and picture your progress. Psycho-Cybernetics builds the self-image of someone who trains. NLP can make exercise feel more appealing. Flow makes sessions absorbing. EFT tapping helps many people clear resistance and self-doubt. Many people also use the Wim Hof Method for energy before training. Explore more in our Health hub.

When to get support

Talk to your doctor before starting if you have a heart condition, high blood pressure, diabetes, joint problems, an injury, are pregnant, or have not been active for a long time. A qualified personal trainer or physiotherapist can teach good technique and build a plan for you. Stop and seek advice if you feel chest pain, dizziness or sharp pain while training.

Frequently asked questions

How often should I do strength training?

The NHS recommends strengthening activities that work all the major muscle groups on at least two days a week. [9]

Do I need a gym to build muscle?

No. Body-weight exercises, resistance bands, yoga and pilates all build strength. [9]

Do I need heavy weights to build muscle?

Not necessarily. A meta-analysis found light and heavy loads built similar muscle when sets were taken close to failure. Heavy loads were better for maximum strength. [10]

How much protein do I need to build muscle?

A meta-analysis found benefits from extra protein levelled off at around 1.6 g per kg of body weight a day. Most people can get this from everyday foods. [4]

What are the health benefits of strength training?

Muscle-strengthening activity has been linked to a 10% to 17% lower risk of death from any cause, heart disease, cancer and diabetes. [6]

How do I stay motivated to work out?

Find your why, make if-then plans, track progress and start small. If-then plans had a medium-to-large effect on reaching goals in a meta-analysis. [11]

Can strength training help my mood?

Yes. A meta-analysis of 33 trials found resistance training reduced symptoms of depression. [7]

The best videos on building muscle

Hand-picked and checked one by one: exercise scientists, coaches and follow-along workouts, plus guided tapping.

The science of building muscle

Follow-along workouts

Tapping for exercise motivation

Books on building muscle

Free resources

Experts to follow

Get help

Talk to your doctor before starting if you have a health condition, an injury, are pregnant or have not been active for a long time. A physiotherapist or qualified trainer can help you start safely.

Find a therapist or counsellor

• US and Canada: Psychology Today (US) and (Canada) directories.
• UK: BACP therapist directory.
• Australia: APS Find a Psychologist, and Relationships Australia for couple and family services.
• Elsewhere, including Europe and India: ask your doctor or local health service for a referral, and check that anyone you see is registered or accredited where you live.

This hub is for information, not a substitute for medical or psychological care.

Sources

1. Yue & Cole (1992), Strength increases from the motor program: comparison of training with maximal voluntary and imagined muscle contractions, Journal of Neurophysiology 67(5):1114-1123
2. Schoenfeld, Ogborn & Krieger (2017), Dose-response relationship between weekly resistance training volume and increases in muscle mass, Journal of Sports Sciences 35(11):1073-1082
3. Schoenfeld et al. (2018), Differential effects of attentional focus strategies during long-term resistance training, European Journal of Sport Science 18(5):705-712
4. Morton et al. (2018), A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength, British Journal of Sports Medicine 52(6):376-384
5. World Health Organization, Physical activity fact sheet
6. Momma et al. (2022), Muscle-strengthening activities are associated with lower risk and mortality in major non-communicable diseases, British Journal of Sports Medicine 56(13):755-763
7. Gordon et al. (2018), Association of efficacy of resistance exercise training with depressive symptoms, JAMA Psychiatry 75(6):566-576
8. Gordon et al. (2017), The effects of resistance exercise training on anxiety: a meta-analysis and meta-regression analysis of randomized controlled trials, Sports Medicine 47(12):2521-2532
9. NHS, Physical activity guidelines for adults aged 19 to 64
10. Schoenfeld et al. (2017), Strength and hypertrophy adaptations between low- vs. high-load resistance training: a systematic review and meta-analysis, Journal of Strength and Conditioning Research 31(12):3508-3523
11. Gollwitzer & Sheeran (2006), Implementation intentions and goal achievement: a meta-analysis of effects and processes, Advances in Experimental Social Psychology 38:69-119
12. Wang, Wang & Gai (2021), A meta-analysis of the effects of mental contrasting with implementation intentions on goal attainment, Frontiers in Psychology 12:565202
13. Locke & Latham (2002), Building a practically useful theory of goal setting and task motivation: a 35-year odyssey, American Psychologist 57(9):705-717
14. Breines & Chen (2012), Self-compassion increases self-improvement motivation, Personality and Social Psychology Bulletin 38(9):1133-1143
15. Lally et al. (2010), How are habits formed: modelling habit formation in the real world, European Journal of Social Psychology 40(6):998-1009

Written by Saj Ali. Last updated 30 October 2026. Spotted an error? Tell us and we will fix it.