I've been lifting on and off since my late twenties. No coach, no plan, no structured program. For years, the goal was personal records. Heavier squats, bigger numbers, the usual. Then injuries piled up, and a doctor told me what I didn't want to hear: "You're in your mid-thirties now, sitting at a desk eight hours a day, then pushing yourself to the brink on weekends. It catches up."

I rewrote my goals entirely. Be healthy. Move without pain. Be capable. That's when strength training stopped being about the gym and started being about the next 40 years.

In the last newsletters I covered the cardio side. Zone 2, VO2max, intervals. All worthwhile. But cardio only covers half the equation. Strength training protects what endurance alone doesn't: metabolic health, bone density, functional independence as you age. This has nothing to do with aesthetics. It's about how long you can live on your own terms.

The number

Momma et al. (2022) analyzed 16 studies with over 250,000 participants in the British Journal of Sports Medicine. The result: just 30 to 60 minutes of strength training per week produces a near-maximum reduction in all-cause mortality.

The dose-response curve is J-shaped. The biggest jump happens early. Two short sessions of 15-20 minutes per week capture most of the mortality benefit. Beyond a certain point, more training doesn't reduce risk further.

But there's an important distinction. 30-60 minutes per week is the longevity floor. It reduces your mortality risk. If you want to actually build muscle, get stronger, and change how your body looks and performs, you need more. Three sessions of 45-60 minutes is where real adaptation happens. The floor keeps you alive longer. The sweet spot changes how you live.

The multiplier

Strength training alone: about 15% lower all-cause mortality.
​Strength training and cardio combined: around 40%.

If you already do cardio, you've done the harder part. You have the habit. Adding strength practically doubles the return. Not double the effort. Double the result.

But what about my cardio?

Strength training and Zone 2 don't compete. Zone 2 barely touches glycogen stores and doesn't compete for the same recovery resources, so both can coexist in the same week without interference. Same day? Strength first, cardio after. Separate days? Even better.

What this looks like in practice

The floor (busy weeks, travel, life happening): two sessions, 20-30 minutes. Squats, deadlifts, pressing, pulling. This already puts you ahead of most of the population.

The sweet spot (normal weeks): three sessions, 45-60 minutes. This is where you build muscle and strength over time. Start at the floor. If it becomes a habit, the sweet spot is where you graduate to.

Can't get to a gym? Buy three kettlebells - they will do. No kettlebells? Calisthenics. Still better than nothing.

What's next

Next newsletter: a concrete beginner program. Which exercises, what structure, what progression. No gym required.

Until then: consistency beats optimization. Every time. People who start strength training at 80 years old still gain muscle and reduce fall risk. There's no "too late."

Know someone who only does cardio? Forward this to them.
Want the full science behind this? Strength Training for Longevity: Your Muscles Are a Longevity Organ

If you want to be the first to know when the25percent app goes live – including a starter strength program – join the waitlist.​

Until next time,
Alessandro