It seems to be a common opinion in the paleo circles, that endurance running and other aerobic exercise is very unhealthy. Someone recently even called it 'aerobic suicide' or something along those lines... But I love to run. I feel that discovering barefoot and minimalist running has been the best thing that has happened to me in the past few years, even better than discovering the paleo diet. My favorite runs are slow, at 70-80% of my max HR, currently lasting from 40 minutes to a hour and a half. Running makes me feel AWESOME, makes me sleep better, is so much fun, makes me feel empowered... Why would something like that be unhealthy and bad for me?
I'm going to seriously look into research about this later on, but now I'd like to hear what you guys have to say. Currently my thinking is that aerobic exercise releases endorphins, because it must have been essential for our survival in the past to run down prey and escape from dangers. But evolution only "cares" about reproduction, not longevity, so even if being able to run would help us raise our kids better it wouldn't necessarily be healthy "in the long run", as we age. Correct?