Dumb luck, picked the right parents? Some of my running friends from back in the day have had knee problems. My mileage was never that high, even during my lat

Dumb luck, picked the right parents? Some of my running friends from back in the day have had knee problems. My mileage was never that high, even during my late 20s: maybe forty miles per week as maintenance, rising to around sixty when training for a marathon. And frankly it wasn't that fast.