Originally Posted by
Trakhak
Perhaps the fact that no one was dumb enough to do hours of continuous high-effort aerobic exercise in freezing temperatures until the (late) 20th century has something to do with it.
Continuous aerobic activity is perfectly fine and healthy as long as you stay is zone 2 or below...The problem starts when people push too hard with too much intensity for too long too frequently. The root of the problem is modern fitness industry and their "no pain no gain mentality" which advocates and encourages that people push themselves into complete exhaustion.by performing too much HIIT and doing too much other high intensity efforts.