The Minimum Effective Dose of Strength Training

In "Something to Train For" I wrote about the competitive play, the sharp end of the Movement pillar, and I kept leaning on one idea: the base you have already built and held. This piece is that base. Most people reading me will never compete, and that is not a lesser path, it is the main one. So this is for the person who wants the honest minimum. Not the minimum to say you worked out, the minimum that actually changes how strong and capable you are for the decades ahead.

Over in the Movement hub, "Our Hybrid Powertrain," I made the case that you need both resistance work and an aerobic base. This is the resistance half, taken down to the least that works.

The minimum, in one paragraph

Three full-body strength sessions a week. Compound movements, the ones that train several muscles at once, chosen to be safe, which for most people starting out means machines before free weights. A leg press, a chest press, a seated row, a shoulder press or lat pulldown, and something for the midline. Roughly forty-five minutes to an hour. That is it. You do not need to learn twenty exercises, you do not need a program that looks like a spreadsheet, you need the same handful of movements done well, three times a week, for years.

I coach full-body over a split on purpose, and the reason is not physiology, it is real life. A split, where you train chest one day and back another and legs another, only works if you actually make every session. Miss a day on a split and a muscle group can wait a week before it comes around again. Miss a day on a full-body plan and you just do the same workout the next time you can get in. The plan has to survive a missed alarm, a work trip, a sick kid. Full-body survives those. That forgiveness is the whole point.

Why it is worth it

I rate this pillar among the highest-leverage things you can do, and here is the honest evidence for why, built on the outcomes that actually decide how you age rather than a step count.

Start with survival. In a pooled analysis of roughly two million adults, people with higher muscular strength had a markedly lower risk of dying over the follow-up, on the order of thirty percent lower for those with the strongest grip compared to the weakest, with the association running slightly stronger in women. That is grip strength, a proxy for whole-body strength that a clinician can measure in seconds. It is observational, so I read it as a powerful and remarkably consistent association rather than proof that building your grip directly buys years. But the direction is not in doubt, and it points the same way across a population the size of a large country: strong people last longer.

Then falls, which is where a lot of good aging quietly ends. A Cochrane review of fifty-nine randomized trials found, with high-certainty evidence, that exercise cuts the rate of falls by about a quarter in older adults living in the community. I want to be precise about what earned that grade, because it is not what a lifting article would like it to be. The strongest and most certain effects were for balance and functional training, and for multi-part programs that combine balance and functional work with resistance. The review was actually uncertain about programs built on resistance training alone. So I will not sell you the barbell as a stand-alone falls cure. I will tell you the truth, which is better: strength is a proven ingredient in the programs that prevent falls, and it works best stacked with the balance and aerobic base I already asked you to keep in the Movement hub. This is exactly why the pillar is one hybrid powertrain, an electric motor and a combustion engine together, and never just the weights.

Then bone. In a randomized trial of postmenopausal women with low bone mass, a supervised resistance and impact program improved bone density at the spine and hip and improved balance and functional strength, in the exact group usually told to be careful and do less. One boundary, stated plainly: that trial used a heavier, higher-intensity protocol than a beginner machine program, under close supervision. So I am not telling you the starter version reproduces those numbers. I am telling you the direction is real, lifting builds bone in the population most afraid of breaking, and heavier bone-focused work is a place this grows into, not where it starts.

And it is never too late to begin. A network analysis of many randomized trials in adults over fifty found that resistance training meaningfully improved strength and physical function, and that pairing it with enough protein was the most effective combination of all. That last part is not a footnote. It is why this piece and "The Protein Floor" hold hands: the protein target I wrote about there, roughly 0.75 to 1.5 grams per pound of your target body weight, is the raw material the lifting signal builds with. Do the work, then feed it.

How much, honestly, and where I diverge

Here is where I step past the evidence on purpose, and I want to be honest that I am doing it.

The research I just walked through is strong on one thing and quiet on another. It is strong that strength matters, that lifting builds bone and function, that it belongs in the programs that prevent falls. What it does not do is hand you a precise dose. The trials use a range, often two or three sessions a week, and the honest one-line summary of what the literature actually proves is close to just do resistance training. That is true, and it is also not a plan. Do something is not a target you can aim at on a Tuesday.

So I give you a target the evidence does not spell out: three full-body sessions a week. That is my divergence, plainly. The studies establish the value and the direction, and I own the specific number as a coaching call, not a finding.

Is three the perfect target? Honestly, no one can say, because the evidence does not resolve the exact optimum, and anyone who tells you they have found the perfect dose is selling something. So here is the judgment I make instead, and it is mine to own. The cost of doing a little too little here is large and quiet: muscle and bone slip away for years before you feel it, and by the time you do, you are climbing out of a hole. The cost of doing a little too much well-managed resistance training is small. Given that lopsided bet, I would rather set the target a touch high than a touch low. So the target is three, not two. If two is all you can reliably hold, take the two, it is real and it is most of the result. But I am going to aim you at three, because I would rather you land just over the line than just under it.

It works, and a break is not a reset

I am not going to invent a fresh success story to sell you this, because I have already told the one I trust most. In "The Protein Floor" I wrote about my wife Cat, who came to this perimenopausal and under-muscled and, once the training and the protein were in place, turned her bone density and her body composition around. That is the proof I keep coming back to. It works, it works for a woman in the years when this gets hardest, and it is never too late to start.

And if life interrupts you, a layoff is a setback, not a reset. Muscle you built and then lost tends to come back faster the second time, a phenomenon called muscle memory, and while the science on exactly why is still being worked out, the practical reality is well recognized.

Before you start

Two cautions, placed lightly, and then I will let you go train.

If you are sedentary, older, or carrying symptoms like chest pressure or dizziness, get cleared by your physician before you start loading, and start on machines with a coach or a knowledgeable trainer who can watch your form. Machines are not a lesser choice here, they are the safe on-ramp, guiding the movement while you build the pattern and the confidence to load it.

And build the plan with your coach and your physician, not off a screen alone, especially if you have a bone diagnosis, a joint replacement, or an injury history. The minimum is simple. Applying it to your body is personal.

The room most people should live in

This is the base, and for most people, most of the time, it is the whole answer. You do not need the competitive ceiling to get almost everything this pillar has to give. Three full-body sessions a week, a handful of safe compound lifts, enough protein behind them, held for years. That is not the beginner version of the work. For a lot of us, it is the work.

From here it grows. There is more structure to add when you want it, heavier and more specific work as you progress, the bone-focused loading that shows up strongest in the research, and yes, the competitive flex I wrote about if you ever decide you want a start line. Those are tiers you climb into by choice. None of them replaces the base. You build them on top of it, the same way you build everything worth keeping. In my Balanced Longevity™ practice, this floor is the base beneath everything else, and for most people it is the whole answer.

Evidence

Highest evidence grade in this article: A · Proven. Each claim below is graded on its own; a high grade for one does not carry to the others.

• Exercise reduces the rate of falls in community-dwelling older adults by about a quarter (Sherrington et al. 2019, Cochrane review): A · Proven. High-certainty evidence from 59 randomized trials, but the certainty is for exercise broadly, strongest for balance and functional training and for multi-component programs that include resistance; the review was uncertain about programs based on resistance training alone. So strength is graded here as a proven component of falls prevention, not a proven stand-alone falls cure.
• Higher muscular strength is associated with lower all-cause mortality (García-Hermoso et al. 2018): C · Moderate. A meta-analysis of observational cohorts covering roughly two million adults; large and consistent, but observational, so it establishes a strong association between strength and survival, not proof that adding strength directly extends a given person's life.
• Resistance training improves bone density and physical function in postmenopausal women with low bone mass (Watson et al. 2017, the LIFTMOR trial, with a published erratum): B · Strong. A single randomized controlled trial; it used a supervised high-intensity resistance and impact protocol heavier than a beginner machine program, so it supports the direction and the population, not the exact magnitudes for a T1 starting point.
• Resistance training improves muscle strength and physical function in adults over fifty, and works better paired with adequate protein (Tian et al. 2025): B · Strong. A network meta-analysis of randomized trials; supports the never-too-late claim and the protein pairing, in older adults generally rather than in any one person.
• Muscle memory, the enhanced response to retraining after a prior training history and a layoff (Sharples and Turner 2023): D · Emerging. A review of an actively developing area; the practical observation that trained muscle returns faster is well recognized, but the underlying cellular and epigenetic mechanisms are still being established.

Sources

• Sherrington C, Fairhall N, Wallbank G, Tiedemann A, Michaleff ZA, Howard K, Clemson L, Hopewell S, Lamb S. Exercise for preventing falls in older people living in the community: an abridged Cochrane systematic review. British Journal of Sports Medicine. 2020;54(15):885-891. https://doi.org/10.1136/bjsports-2019-101512
• Garcia-Hermoso A, Cavero-Redondo I, Ramirez-Velez R, Ruiz JR, Ortega FB, Lee DC, Martinez-Vizcaino V. Muscular Strength as a Predictor of All-Cause Mortality in an Apparently Healthy Population: A Systematic Review and Meta-Analysis of Data From Approximately 2 Million Men and Women. Archives of Physical Medicine and Rehabilitation. 2018;99(10):2100-2113.e5. https://doi.org/10.1016/j.apmr.2018.01.008
• Watson SL, Weeks BK, Weis LJ, Harding AT, Horan SA, Beck BR. High-Intensity Resistance and Impact Training Improves Bone Mineral Density and Physical Function in Postmenopausal Women With Osteopenia and Osteoporosis: The LIFTMOR Randomized Controlled Trial. Journal of Bone and Mineral Research. 2018;33(2):211-220. https://doi.org/10.1002/jbmr.3284
• Erratum: High-Intensity Resistance and Impact Training Improves Bone Mineral Density and Physical Function in Postmenopausal Women With Osteopenia and Osteoporosis: The LIFTMOR Randomized Controlled Trial. Journal of Bone and Mineral Research. 2019;34(3):572. https://doi.org/10.1002/jbmr.3659
• Tian H, Qiao W, Wen X. Comparison of the Effectiveness of Protein Supplementation Combined with Resistance Training on Body Composition and Physical Function in Healthy Elderly Adults. The Journal of Nutrition. 2025;155(3):764-774. https://doi.org/10.1016/j.tjnut.2025.01.017
• Sharples AP, Turner DC. Skeletal muscle memory. American Journal of Physiology-Cell Physiology. 2023;324(6):C1274-C1294. https://doi.org/10.1152/ajpcell.00099.2023