90 Minutes of Strength Training a Week: The Amount That Ext…

90 Minutes of Strength Training a Week: The Amount That Extends Your Life

How much strength training do you actually need to get the maximum longevity benefit? A study published in June 2026 in the British Journal of Sports Medicine has the most precise answer ever produced from population data: 90 to 120 minutes per week. Not more, not less.

The Largest Study of Its Kind

Researchers from the Harvard T.H. Chan School of Public Health tracked 147,000 adults for up to thirty years, with the goal of quantifying the relationship between resistance training and all-cause, cardiovascular, and neurological mortality.

The central finding is clear. People who did 90 to 119 minutes of strength training per week had a 13% lower risk of dying from any cause compared to those who did none. For cardiovascular disease mortality, the benefit was 19%. For neurological diseases — Alzheimer's, Parkinson's, dementia — it climbed to 27%.

That's two 45-minute sessions per week, or three 30-minute sessions. An achievable amount for most healthy adults.

Above 120 Minutes, Benefits Plateau

One of the most significant findings is what happens above 120 minutes per week: nothing. No additional mortality reduction was observed. Doing 3 hours, 5 hours, or 10 hours of lifting per week doesn't improve longevity outcomes beyond the 90-120 minute mark.

This isn't a surprise to researchers. The relationship between exercise and health follows a J-curve — benefits are substantial at moderate doses, then level off. What's new is the precision of the dose identified across such a large population over such a long follow-up period.

Combining Strength Training With Cardio: The Amplified Effect

The study also analyzed training combinations. People who did both strength training and aerobic exercise (running, cycling, swimming) showed significantly larger benefits than those who only did one or the other.

Current WHO guidelines already recommend this combination: 150-300 minutes of moderate aerobic activity per week, plus two sessions of muscle-strengthening activity. This study puts a specific number on the muscle-strengthening component. For a deeper look at how these two training styles interact, combining cardio and strength training doesn't compromise muscle growth, according to updated meta-analysis data.

Why Lifting Protects the Brain

The 27% reduction in neurological disease risk is arguably the most striking number. How does strength training protect the brain?

Several mechanisms are documented. Resistance exercise stimulates BDNF (brain-derived neurotrophic factor), a protein that promotes neuron growth and survival. It improves cerebral insulin sensitivity, reduces chronic systemic inflammation, and maintains muscle mass — which is an indicator of the metabolic reserve associated with resistance to neurodegenerative disease.

What This Means for Your Training

If you're already doing two roughly 45-minute strength sessions per week, you're in the optimal window this study identified. You don't need to do more to maximize the longevity benefit.

If you're below 90 minutes per week, even a small increase — going from one session to two — delivers significant benefits. The biggest jump remains going from zero to something, as the ACSM's first resistance training update in 17 years also emphasized.

If you're doing significantly more? This study doesn't say it's harmful. It says longevity-specific benefits don't compound beyond 120 minutes. The extra training may bring other benefits — performance, body composition, wellbeing — but the mortality benefit curve has stabilized by then.