Haha there is such a thing as over training, but most people wouldnt get anywhere near that!
why? easy to over train running, shin splits and fascitis , ligment tear, stress fractures ...
Maybe from asphalt jogging, but low impact natural terrain jogging as part of a regimen that includes weight lifting & maybe sports is ideal. Can't save everyone & can't prevent injury from life in general. Refrain from jogging at your own risk.
yea asphalt sucks, but you're right, simplest thing to get fit and have fun is to run. Getting injured sucks tho, many ppl get overzealous at the start and overtrain.
If you make me choose between the two extremes I'm taking the overtrain crowd.