The Strength Training Sweet Spot: Why 90 Minutes a Week Is All You Need
New research tracking 147,000 people over 30 years found a precise weekly strength training target linked to significantly lower mortality risk. Here's what that means for your week.
Loraine Berriman
6/13/20265 min read
It's a Tuesday afternoon. You've got two small windows in your week, both about 45 minutes. Your first thought is that it's not worth it. That you'd need at least an hour to do it properly. You'll wait until things settle.
They don't settle.
This is where most people sit. Not because they don't care, and not because they lack the discipline. They've convinced themselves that anything less than a full, committed training block doesn't count. So they either do too much when life allows and fall off when it doesn't, or they do nothing at all and call it a waiting game.
Here's the problem with both: neither is based on what the research actually says. And the research has a very specific answer.
The All-Or-Nothing Trap
Most people approach training in one of two ways. All in when life cooperates. Nothing when it doesn't. The cycle repeats, and nothing changes.
The quieter version is just as common. These are the people who tell me they're waiting to get consistent before they commit properly. Which is a bit like saying you'll start eating well once your digestion improves. The consistency is the programme. You don't wait for it. You build it.
Both traps share the same root cause: the belief that meaningful results require significant volume. That if you can't train properly, you might as well not train at all. The evidence does not support that, and it's worth understanding exactly what it does say.
What I've Seen Change Everything for My Clients
I had a client a few years back. Busy mum of three, running a household, part-time work, no predictable routine. When she came to me, she was doing everything in bursts. Big effort for two weeks, then nothing for a month. She thought the problem was motivation. It wasn't. It was structure.
We stripped her programme back to something her week could absorb. Two focused resistance sessions, wherever she could fit them. Consistent movement on most other days. Nothing complicated. Just two sessions, done well, built to progress over time.
Three months later, her body composition had shifted, her energy had levelled out, and the exhausting on-off cycle had stopped. The volume was never the issue. The precision was.
What 30 Years of Research Actually Found
A study published in the British Journal of Sports Medicine tracked more than 147,000 people over three decades. The researchers wanted to know exactly how much resistance training produces real longevity benefits. What they found is specific enough to change how you think about your week.
People performing 90 to 120 minutes of resistance training per week had a 13% lower risk of death from any cause. A 19% lower risk from cardiovascular disease. A 27% lower risk from neurological disease. Critically, the researchers found no additional benefit above the 120-minute mark. More training did not produce better outcomes.
Two sessions of 45 minutes each. That is the number.
When that resistance work was combined with consistent aerobic activity, the results compounded. Participants who paired regular cardio with 60 to 119 minutes of weekly strength training saw overall mortality risk fall by around 45%. That is not a small adjustment to your long-term health. That is a fundamental one.
The point isn't that two sessions a week is a ceiling. It's that two well-constructed sessions, done consistently, produce results that most people will never achieve from five inconsistent ones.
What Those Two Sessions Need to Look Like
Programme design is what separates results from wasted effort. Two sessions that simply chase fatigue are not delivering the same stimulus as two well-engineered ones.
A well-structured 45-minute session should be built around compound movements. Exercises that load multiple large muscle groups at once. Squats, hip hinges, pressing movements, rows. These recruit the most tissue, drive the strongest adaptive response, and deliver the highest return per minute. Isolation exercises have their place, but they are not the priority.
Progressive overload is what makes the whole thing work. Your programme needs to build over time. The same weights and the same effort, week after week, stop producing adaptation after around six weeks. Your body has no reason to change if you're not asking more of it.
For anyone over 40, 72 hours between resistance sessions is a sound working principle. A Monday-Thursday or Tuesday-Friday structure tends to work better than consecutive days, because recovery between sessions is part of the stimulus, not an obstacle to work around.
Aerobic work fills the rest of the week. Thirty to forty minutes of moderate-intensity movement, four or five times a week, is enough to produce the compounding effect the research describes. A brisk walk. A cycle. A swim. It does not need to be structured or equipment-based. It needs to be consistent.
The Part Most People Get Backwards
The barrier to a training programme that genuinely improves your long-term health is not time. It's the persistent belief that what you can realistically fit in isn't enough to be worth doing.
Two focused resistance sessions and consistent movement on most other days. That fits into almost anyone's week, including the difficult ones.
The people who are in the worst physical condition at 55 are rarely the ones who stopped caring. They're the ones who kept waiting for the right conditions. The ones who remain physically capable, mentally sharp, and genuinely well in their 50s and beyond are rarely training as much as you'd expect. They're training consistently, with a programme built around their actual life, and someone is making sure they follow through on it.
Are you Ready to Do This Properly?
If you've been waiting for the right time, the research is telling you something worth hearing: the right programme is far more achievable than you've been assuming. The gap isn't hours. It's structure and accountability.
Send us a message to see how we can help you.
Frequently Asked Questions
Does it matter what kind of resistance training I do?
The research included free weights, resistance machines, and bodyweight exercises like squats, press-ups, and lunges. The movement pattern matters more than the equipment. Compound exercises that load large muscle groups will produce a better return per session, but the most important variable is consistency and progression over time.
Can I do both sessions on the weekend if I can't train during the week?
Weekend-only training produces some benefit, but less than spreading sessions across the week. Muscle tissue needs time to recover and adapt between loading sessions. Two sessions spread through the week, even short ones, will outperform two back-to-back sessions for most people.
What qualifies as aerobic activity?
Brisk walking, running, swimming, cycling, and stair climbing all count. Intensity is the key variable. Moderate intensity means working hard enough that holding a conversation requires some effort. A brisk 35-minute walk at real pace qualifies. A slow stroll does not.
Is nutrition part of this, or is the research purely about exercise?
Training and nutrition are a single system. The outcomes the study measured, cardiovascular health, neurological resilience, body composition, are all directly influenced by what you're eating. A well-structured resistance programme running alongside poor nutritional habits will produce a fraction of its potential return. Protein intake becomes more important after 40, not less.
Does it matter whether I train at home or in a gym?
Not at all. What determines results is whether the programme is built around your actual life, whether it progresses over time, and whether someone is keeping you accountable to it. Location is irrelevant. Structure is everything.
Further reading on The Fitness Edit: 'How to Build Sustainable Fitness Habits That Last'
Loraine Berriman Founder & Head Coach | The Fitness Edit
Loraine Berriman is an internationally certified personal trainer and the founder of The Fitness Edit, a high-performance coaching consultancy serving professionals on the Garden Route and globally. She specialises in bespoke, data-driven transformation programmes for people who have outgrown generic fitness solutions.
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