That's not how they defined heavy and medium in the study. Here's what the heavy cohort did: > At a commercial gym, HRT performed a supervised full body progra

That's not how they defined heavy and medium in the study. Here's what the heavy cohort did: > At a commercial gym, HRT performed a supervised full body programme three times per week, with 6–8 weeks of initial habituation. The periodisation programme was machine based and each exercise included 3 sets of 6–12 repetitions at ~70%–85% of 1 RM, which was estimated using the prediction equation according to methods by Brzycki. This seems pretty reasonable to me regardless of age, the heavy program didn't include testing 1RM. It was 3x6-12 of each exercise at around 75% of 1RM. Sounds like an ordinary weight training program. With 6-8 weeks of habituation most older people could probably do this. All machines so pretty safe. The medium program didn't even use weights - it was all bands and bodyweight and unusually high reps at 55% of 1RM. I don't know any serious lifter who would recommend that program, I haven't even thought about how you would measure a 1RM for exercises that don't use weights? So not sure what this is but I'm unsurprised that the heavy program worked better. The medium program included circuit training and kinda sounds more like a cardio routine, wonder if that's the comparison they were going for