> See athletes for common ailments. This is a good point, and it's a good idea to pick a form of exercise that has less impact, (at an extreme end, I'm sure th

> See athletes for common ailments. This is a good point, and it's a good idea to pick a form of exercise that has less impact, (at an extreme end, I'm sure that the skiiers who do mogul racing are in great shape, but their knees probably don't work so well after a few years) but keep in mind that the body repairs itself. As long as you aren't repeatedly destroying your joints, you're going to get a lot of benefits from exercise. In many cases, athletes are less likely to get injured than the sedentary population because of increased strength and flexibility.