We're really a furnace burning oxygen inside which deteriorate cells faster when you're doing sports competitively, sports are great for health, what about comp

We're really a furnace burning oxygen inside which deteriorate cells faster when you're doing sports competitively, sports are great for health, what about competitive sports? is it really that good? is there any data showing that they live longer and healthier because of those intense exercise? I exercise regularly but always had this doubt about "over-exercise" that could do more harm than good.