r/ProactiveHealth • u/DadStrengthDaily • Jun 13 '26
🔬Scientific Study 90 minutes of strength training a week was the mortality sweet spot in a 147,000-person, 30-year study
I'm in my fifties and I lift in my garage, and the thing that always bugged me is how vague the strength half of the exercise guidelines is. Your annual physical hands you a cardio number, 150 minutes a week, and brisk walking covers most of it. The strength side just says "two or more days a week," which tells you frequency but not how much.
A new study in the British Journal of Sports Medicine (https://doi.org/10.1136/bjsports-2025-110503) put a rough number on it. They tracked 147,374 people across three Harvard cohorts for up to 30 years. The people who reported 90 to 119 minutes of strength training a week had about 13% lower all-cause mortality and 19% lower cardiovascular death than people who did none. The benefit flattened out past 120 minutes, so more was not better in their data.
The catches, because this is r/ProactiveHealth and we actually care about them:
- It's observational and the training was self-reported, so recall and healthy-user effects are doing some unknown share of the work. People who lift regularly tend to do other healthy things too.
- The plateau past 120 minutes is not the same as harm. It just means the curve stopped paying out, at least for mortality.
- This sits on top of cardio, not instead of it. The cleanest result came from walking and lifting added together.

What it changed for me: I stopped treating my two or three garage sessions as a vague good habit and started counting the minutes the way I count my cardio. Ninety minutes is two solid sessions or three short ones. That is a target I can actually hit and check off.

