How Much Strength Training Is Enough? 90-120 Minutes a Week
About 90 to 120 minutes of strength training a week is linked to a lower risk of early death, according to a large Harvard study of nearly 150,000 US health professionals. That's two or three decent sessions, not a lifestyle overhaul.
The study is observational, so it shows a link, not proof that lifting adds years.
Even so, it gives a realistic target, and it suggests that going past 120 minutes doesn't do much more for overall mortality.
What the study found
The research came from the Harvard T.H. Chan School of Public Health and was published in the British Journal of Sports Medicine in June 2026. It pooled data from three long-running cohorts (the Nurses' Health Study, Nurses' Health Study II and the Health Professionals Follow-Up Study), covering nearly 150,000 adults followed for up to 30 years. Average age at entry was 54, and participants reported their own exercise.
Compared with people who did no strength training, those averaging 90 to 119 minutes a week had:
a 13% lower risk of death from any cause
a 19% lower risk of death from cardiovascular disease
a 27% lower risk of death from neurological disease, such as Alzheimer's
Beyond 120 minutes a week, the study found no further reduction in these risks. For cancer deaths, the lower risk showed up at smaller amounts, roughly 1 to 59 minutes a week, and didn't grow with more.
Cardio mattered too. People who combined strength training with regular aerobic exercise had among the lowest death rates in the study, up to 45% lower than people who did neither. If you walk, run, cycle or swim, you're already covering the other half.
The limits are real. This is observational data from health professionals, exercise was self-reported, and people who lift may differ in other ways (diet, sleep, health care access). The researchers adjusted for factors like age, smoking, diet and alcohol, but no adjustment removes every difference. Treat 90 to 120 minutes as a sensible target, not a guarantee.
What 90 to 120 minutes looks like in a real week
It's less than most people expect. Several combinations get you there:
Weekly total | One way to split it |
90 minutes | Three 30-minute sessions |
100 minutes | Two 50-minute sessions |
120 minutes | Two 60-minute sessions, or three 40-minute sessions |
A week that includes cardio might run like this:
Monday: 40 minutes of full-body strength
Tuesday: walk or ride
Thursday: 50 to 60 minutes of strength and conditioning
Saturday: sport, a hike, a swim, or a third strength session
Other days: rest or easy movement
This is only an example. A shift worker, a parent, a tradie and a retiree will all land on different weeks. What matters is the weekly total. If your sessions are short, add one. If they're longer and well planned, two may be enough.
What counts as strength training, and how hard to push
Any exercise where your muscles work against resistance counts: weights, machines, bands, body weight, or loaded carries. It doesn't have to be heavy barbell work or bodybuilding. A decent week covers the main movement patterns:
Squats or sit-to-stands
Lunges or step-ups
Hip hinges, like deadlifts or kettlebell swings
Push-ups or chest presses
Rows or pull-downs
Carries, such as farmer's carries
Core work that builds control, not just crunches
The headline figure is time, so the study can't tell you how hard to push. As a coaching rule of thumb (not a study finding), aim for sets that feel around 7 or 8 out of 10, where you could manage another one or two clean reps. Form stays tidy, and you walk out feeling like you trained, not flattened. Too easy and there's little reason to adapt. Too hard, too often, and recovery becomes the limit.
This is where coaching earns its keep. A beginner might box squat with light dumbbells, while an experienced lifter front squats a barbell. Same pattern, different load.
If you're new, returning, or already training
New to lifting. Start below 90 minutes and build up. Two sessions of 25 to 35 minutes a week is a good start: simple full-body movements, light to moderate weights, rest days between, and small increases over several weeks. The first goal is learning the movements and recovering well, not hitting a number.
Coming back after time off. Same approach. Muscle returns quickly, but tendons, joints and your recovery capacity take longer to catch up.
Already training. If you lift more than 120 minutes a week, that's fine for performance, sport or enjoyment. Just know that the study found no extra benefit to overall mortality past that point. If extra volume brings sore joints, sloppy form, low energy or skipped sessions, scale back.
A useful test for any plan: can you repeat it next week? If yes, it's probably close. If no, it's too ambitious for where life is right now.
A simple 45-minute session, and recovery
A useful session doesn't need to be complicated. One way to spend 45 minutes:
Part | Time | Purpose |
Warm-up | 5 to 8 min | Raise body temperature, prepare joints |
Main lift | 10 to 15 min | One key strength movement |
Secondary work | 15 to 20 min | Balanced strength through the rest of the body |
Carries or conditioning | 5 to 8 min | Work capacity |
Cool-down | 2 to 5 min | Bring breathing down |
That could be goblet squats, push-ups, rows, Romanian deadlifts, planks and farmer's carries. Another day it might be step-ups, dumbbell presses, band rows, hip bridges and sled pushes. Simple movements are often the best tools because you can learn them, repeat them and progress them. Progress can mean a little more weight, an extra rep, better control, a deeper range or shorter rests.
Training gives the signal, and recovery lets your body respond. Sleep as well as you can, eat enough protein across the day, drink water, and take rest days seriously. Soreness isn't the goal. A better sign is that you move well, feel more capable, and everyday tasks feel lighter.
Making it fit your week
The easiest plan is the one that survives a busy week. Anchor it to fixed points: one class that covers strength and conditioning, one shorter session on your own, and an optional home session if the week allows.
That could be the Thursday 6am Strength & Conditioning class, then a second session on the weekend or early the next week. For members the Thursday class is free, so it's an easy way to add a structured session without planning it yourself. A class also gives you variety, effort and accountability, and turning up is usually the hardest part.
If mornings are tough, take the friction out the night before: lay out your gear, fill a bottle, sort a simple breakfast, book the class if needed, and get to bed a bit earlier. Small steps like these do more than motivation.
FAQ
How many days a week should I lift? The study's headline figure is weekly minutes, so the split is up to you. Two longer sessions or three shorter ones both reach 90 to 120 minutes. Pick the pattern you can repeat.
Is 30 minutes a week worth doing? The strongest results for overall death risk were at 90 to 119 minutes. But the cancer-related benefit showed up at lower amounts, and one of the study's authors said small amounts can still matter for people who are less active. If you're starting from zero, build up to the target rather than skipping it.
Do I need more than 120 minutes? For overall mortality, the study found no added benefit beyond 120 minutes. Train more if you want to for sport, performance or enjoyment, but you don't need to for this.
Do I still need cardio? The lowest death rates were in people who combined strength training with regular aerobic exercise, so it's worth keeping both.
The bottom line
Aim for 90 to 120 minutes of strength training a week, spread over two or three sessions, and keep some aerobic exercise in the mix. Build up to it if you're new. Keep the effort hard enough to matter and easy enough to repeat. No single habit guarantees a long life, and this article is general information, not personal medical advice.
If you're in Matakana and already a member, Thursday's 6am Strength & Conditioning class is a simple place to start.
Sources
Original paper, British Journal of Sports Medicine: "Long-term resistance training with all-cause and cause-specific mortality: assessing dose-response and joint associations with aerobic physical activity"
______________________________________________________________________ Justin, Keep Fit Matakana 📍 Matakana Village, Auckland | keepfitmatakana.co.nz Follow us on Instagram @keepfitmatakana for more tips from the team.
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