Is One Strength Training Session a Week Enough? What the Evidence Says

For many people, one strength training session a week is enough to get stronger. That's especially true if you're new to lifting or starting from a low level of strength. But "enough" depends on your goal. Health guidelines in the US, UK, Canada and Australia all recommend muscle-strengthening activities on at least two days a week, and research shows that training a muscle twice a week builds more muscle than training it once.

So think of one session a week as a worthwhile minimum rather than the ideal. Below, you'll find what the latest evidence says, how it applies to older adults and people with sarcopenia (age-related muscle loss), whether light or heavy weights work better, and how to get the most from a single weekly workout.

This article is for general informational purposes and is not a substitute for professional medical advice, diagnosis or treatment.

What the Newcastle University researcher found

The question got fresh attention after Christopher Hurst, a senior research associate at Newcastle University in the UK, wrote an article reviewing the evidence on strength training and healthy ageing. It was first published by The Conversation in March 2026 and republished by ScienceDaily in October 2026. His main points:

• One session can help. "A single session per week can be enough to produce meaningful gains in strength, particularly in people new to training."
• Effort matters more than the weight on the bar. "Performing 20 to 25 repetitions with a lighter weight can produce similar improvements to lifting a heavier weight ten times, provided the effort is high."
• It's never too late. "Even people in their 80s and 90s can build or maintain muscle strength with appropriate support."

Hurst describes strength training as "one of the most accessible, effective and low-cost ways to influence how well we age." His article is an expert summary rather than a new study, so the sections below look at the guidelines and research behind these points, including where the picture is more complicated.

How often should you lift weights? What the guidelines say

National guidelines agree on the target. They recommend muscle-strengthening activities that work all the major muscle groups (legs, hips, back, abdomen, chest, shoulders and arms) on at least two days a week:

The American College of Sports Medicine (ACSM) reached a similar conclusion in its 2026 position stand on resistance training. "Training all major muscle groups at least twice a week matters far more than chasing the idea of a 'perfect' or complex training plan," ACSM says.

Guidelines also stress that something is better than nothing. The CDC's advice for older adults says that if you have trouble meeting the recommendations, you should be as active as your abilities and conditions allow, and to "remember that some physical activity is better than none at all." For someone who does no strength training now, one session a week is a real step forward.

Once vs. twice a week: what the research shows

Whether one session is "enough" depends on what you want from it.

For getting stronger

Hurst's point is that one session a week can bring meaningful strength gains, "particularly in people new to training." If you're a beginner and your goal is to feel stronger in everyday life, a single well-planned weekly session is a reasonable place to start.

For building muscle

For muscle size, more frequent training appears to work better. A 2016 meta-analysis in Sports Medicine pooled studies that compared training a muscle one to three times a week with the same total amount of work. It concluded that "frequencies of training twice a week promote superior hypertrophic outcomes to once a week," and recommended training major muscle groups at least twice a week to maximize muscle growth. Whether three times a week is better than two remains unclear.

Why weekly volume matters

Part of the reason is volume, meaning how many hard sets each muscle gets per week. For muscle growth, ACSM's 2026 guidance suggests aiming for about 10 sets per muscle group per week. Fitting that into one session means a long workout. Spreading it over two or three sessions is usually easier to manage and recover from.

The practical takeaway: one session a week is enough to start getting stronger. If you want to build noticeably more muscle, or you stop making progress, adding a second session is the most reliable next step.

Strength training for older adults

Strength training has been studied extensively in older adults. A Cochrane review pooled 121 trials with 6,700 participants. In most of the trials, people trained two to three times a week at a high intensity. The review found:

• a large positive effect on muscle strength
• a moderate to large improvement in the ability to get up from a chair
• a modest improvement in walking speed
• less pain in people with osteoarthritis, in a smaller number of trials

Serious adverse events were rare, and none were reported to be directly related to the exercise. Musculoskeletal complaints, such as joint pain and muscle soreness, were reported in many studies, which is a good reason to start gently and build up.

US and UK guidelines for people aged 65 and over still recommend strength work on at least two days a week, ideally alongside balance activities. If you're starting from scratch, though, one session a week is a sensible way in. Staying active matters as you get older; our article on why a sudden drop in physical activity can be an early warning sign explores one reason why.

Sarcopenia: when once a week can still help

Sarcopenia is "a generalised skeletal muscle disorder characterised by reduced muscle strength and mass," according to a 2022 review in Age and Ageing led by Hurst and colleagues at Newcastle University. It leads to reduced physical function and mobility. Hurst notes that it affects a substantial proportion of older adults, particularly those over 70, and that people with several long-term conditions are at greater risk.

The review describes resistance exercise as the first-line treatment for sarcopenia. On frequency, it says that "two training sessions per week should represent the standard prescription for older adults with sarcopenia." But it adds an important exception: "in those individuals with low baseline muscle strength or severe sarcopenia, a single RE session per week could still confer significant benefit."

A 2025 network meta-analysis in Frontiers in Physiology points the same way. It combined 13 randomized trials with 711 older adults with sarcopenia and found that two to five sessions a week was the effective range for improving grip strength, with three a week working best. It only looked at grip strength, so it doesn't tell the whole story, but it supports building up to more than one session where possible.

The Age and Ageing review also gives practical guidance for people with sarcopenia:

• Sets and reps: 1 to 3 sets of 6 to 12 repetitions.
• Load: start at a lower intensity, around 40% to 60% of the most you can lift once, and build up toward 70% to 85%.
• Effort: work with "a relatively high degree of effort." By the end of the first set, your muscles should feel tense, warm or shaky.
• Progression: increase the challenge gradually and systematically, so your body keeps adapting.
• Support: learn the correct technique first, ideally with a physiotherapist or trained instructor, after an assessment of your overall health.

If you've noticed you're getting weaker or finding everyday tasks harder, talk to your doctor or a physiotherapist before starting. They can check for sarcopenia and other causes, and tailor exercises to you.

Sarcopenia exercises you can do at home

You don't need a gym. The NHS suggests these gentle strength exercises for people who haven't been active for a while. Use a solid, stable chair for support:

1. Sit-to-stand: stand up from a chair using your legs only, then slowly sit back down. Aim for 5, done slowly.
2. Mini-squats: holding the back of a chair, bend your knees a little while keeping your back straight. Repeat 5 times.
3. Calf raises: holding the chair, lift your heels off the floor, then lower them. Repeat 5 times.
4. Sideways leg lift: holding the chair, lift one leg out to the side and lower it. Repeat 5 times on each leg.
5. Leg extension: standing upright and holding the chair, lift one leg straight behind you and hold for 5 seconds. Repeat 5 times on each leg, without arching your back.
6. Wall press-up: stand at arm's length from a wall, place your hands on it at chest height, and bend your arms to bring your chest toward the wall. Do 3 sets of 5 to 10.
7. Biceps curls: curl light weights up toward your shoulders, sitting or standing. Do 3 sets of 5 with each arm.

The NHS advises building up slowly and gradually increasing the number of repetitions. Once these feel easy, you can gradually make them harder, for example by adding repetitions or, with advice, using light weights or a resistance band.

Everyday activities count too. The NHS lists carrying heavy shopping, heavy gardening such as digging, yoga, pilates, tai chi, resistance-band workouts and body-weight exercises like push-ups as strengthening activities. If you'd like a gentle, low-impact practice, our article on Baduanjin exercise looks at one traditional option.

Light weights vs. heavy weights

You don't have to lift heavy to benefit. As Hurst points out, lighter weights lifted for more repetitions, around 20 to 25, can bring similar improvements to heavier weights lifted about 10 times, as long as the effort is high. The key is that the last few repetitions of each set feel genuinely hard.

The details depend on your goal. ACSM's 2026 guidance recommends heavier loads, around 80% of the most you can lift once, for 2 to 3 sets per exercise if your main goal is maximum strength. For muscle growth, ACSM focuses on the total amount of work across the week, about 10 sets per muscle group. ACSM also found that training to complete muscle failure "did not consistently impact outcomes for the average healthy adult," so you don't need to push every set until you can't do another repetition.

In practice:

• Beginners and older adults can start with light weights, resistance bands or body weight and focus on technique.
• To build muscle, light or moderate weights work if your sets are challenging.
• To maximize strength, gradually include some heavier sets with fewer repetitions once your technique is solid.

As ACSM puts it, "The best resistance training program is the one you'll actually stick with."

Strength training and a longer life

Strength training may also be linked to a longer life. A 2026 study in the British Journal of Sports Medicine, described by ScienceDaily, followed 147,374 adults in three large US cohorts for about 30 years. People who did 90 to 120 minutes of strength training a week had a 13% lower risk of dying from any cause during the study. There was no extra benefit above 120 minutes a week. A lower risk of dying from cancer appeared at smaller amounts, from 1 to 59 minutes a week, and the strongest results were seen in people who combined strength training with aerobic exercise.

This was an observational study, so it shows a link rather than proof that strength training caused the lower risk. People who lift weights may differ in other ways that affect their health. Still, it suggests that even modest amounts of strength training are worth doing. For the wider benefits of exercise, see our guide Is Fitness Worth the Hype?

How to make one session a week count

If one session is all you can manage, plan it well:

1. Work every major muscle group. Cover your legs, hips, back, abdomen, chest, shoulders and arms, the muscle groups that US guidelines recommend training.
2. Choose 6 to 8 exercises. For example: squats or sit-to-stands, a hip exercise such as a glute bridge, a row with a resistance band or dumbbell, a push-up or wall press-up, an overhead press, calf raises, and a plank or another core exercise.
3. Do 2 to 3 hard sets of each. Use 6 to 12 repetitions with a moderate or heavier weight, or 20 to 25 with a lighter one. The last repetitions should be difficult but still done with good form.
4. Warm up first. Start with a few minutes of easy movement and a light set of your first exercise.
5. Progress gradually. When you can do more repetitions than your target with good form, add a little weight or a few repetitions next time.
6. Keep a simple log. Write down the exercises, weights and repetitions so you can see your progress and know when to make things harder.

Strength training works alongside the rest of your routine. If you're looking for meal ideas with more protein, see our high-protein breakfasts. And if you're losing weight, including with medication, ask your care team how strength training fits into your plan; our article on maintaining weight loss on GLP-1 drugs covers the bigger picture.

When to add a second session

One session is a good start, but consider adding another if:

• you want to meet the guidelines of at least two days a week
• your main goal is building muscle, since twice a week works better than once
• you have sarcopenia and your doctor or physiotherapist says you're ready, since two sessions are the standard prescription
• your progress has stalled for several weeks

A second session doesn't have to be long. You could split your current workout into two shorter ones, or add a 15-minute home session using the NHS exercises above.

Staying safe

• Check first if you need to. The NHS advises speaking to a GP first if you haven't exercised for some time, or if you have medical conditions or concerns.
• Start light and learn the technique. Good form matters more than the weight, especially at the beginning.
• Build up gradually. Increase weights or repetitions in small steps.
• Use stable support. For chair-based exercises, choose a solid, stable chair.
• Listen to your body. Muscles should feel worked, not injured. If an exercise causes pain, stop and get advice from a health professional.

Frequently asked questions

Can you build muscle with one workout a week?

You can build some, especially as a beginner. But for muscle growth, research shows that training each muscle twice a week works better than once, so a second session helps if size is your goal.

Is once a week enough for older adults?

It can help, especially for people who are starting with low strength or have severe sarcopenia. Two sessions a week remain the standard recommendation, so build up when you can.

How long should one strength session be?

There's no fixed time. It should be long enough to work all your major muscle groups with a few hard sets each. For many people, that fits comfortably within an hour.

Do I need to train until I can't lift any more?

No. ACSM's 2026 guidance found that training to muscle failure did not consistently change results for the average healthy adult. Aim for sets that feel hard by the end, while keeping good form.

Can I do strength training at home without equipment?

Yes. Body-weight exercises such as sit-to-stands, wall press-ups and calf raises, along with resistance bands, can all build strength. The NHS also counts heavy gardening and carrying shopping as strengthening activities.

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Written by: Ibrahim Abdo, founder and editor of Healthy89. Ibrahim researches and writes evidence-based health guides for general readers.
Medical review: Not medically reviewed. Facts were checked against the sources below.
Published: October 4, 2026

Sources

1. Newcastle University. Strength training may be the key to healthy ageing (Christopher Hurst, first published in The Conversation). March 5, 2026.
2. ScienceDaily. Even one strength training session a week could make a difference. Source: Newcastle University. October 2, 2026.
3. Hurst C, Robinson SM, Witham MD, et al. Resistance exercise as a treatment for sarcopenia: prescription and delivery. Age and Ageing. 2022;51(2):afac003.
4. Schoenfeld BJ, Ogborn D, Krieger JW. Effects of resistance training frequency on measures of muscle hypertrophy: a systematic review and meta-analysis. Sports Medicine. 2016.
5. Optimal dose of resistance training to improve handgrip strength in older adults with sarcopenia: a systematic review and Bayesian model-based network meta-analysis. Frontiers in Physiology. 2025.
6. Liu C-J, Latham NK. Progressive resistance strength training for improving physical function in older adults. Cochrane review.
7. American College of Sports Medicine. Resistance training guidelines update 2026 (position stand published in Medicine & Science in Sports & Exercise, April 2026).
8. ScienceDaily. Scientists found the strength training sweet spot for a longer life (study published in the British Journal of Sports Medicine, 2026). June 2026.
9. Centers for Disease Control and Prevention. Physical activity guidelines for adults.
10. Centers for Disease Control and Prevention. Physical activity guidelines for older adults.
11. NHS. Physical activity guidelines for adults aged 19 to 64.
12. NHS. Physical activity guidelines for older adults.
13. NHS. Strength exercises.
14. Canadian Society for Exercise Physiology. Canadian 24-Hour Movement Guidelines for Adults aged 18–64 years.
15. Australian Government Department of Health. Physical activity and exercise guidelines for adults (18 to 64 years).