I’ve read that our national dumpster fire believes exercise is unwise. That’s not a surprise.
It does remind me though of an open medical question — what is the optimal amount of physical activity?
We know the optimal amount of activity is far more than most Americans do. We suspect there are limits though. Most people should not try to deadlift 400 lbs without a lot of training and some helpful genetics. Likewise few bodies will do well running a marathon every other week.
That’s a pretty wide range though. It would help to have a guide for various ages. For example, I’ve found I run into trouble if I do full CrossFit workouts more than 3-4 times a week, but I bet 30 years ago I’d have been ok at 5-6 times a week. Once I’d have done well mountain biking daily, now my arthritic knees prefer 2-3 times a week.
When our stem cells are happy we don’t wear out like a camera shutter. When they’re depleted we may truly have a limited number of clicks. On the other hand, sometimes a set of heavy back squats puts my knees right for a week or more. That’s just weird.
There’s quite a bit of research on this question. It’s worth following …