This article got my attention this morning. As reported in RunnersWorld, a study shows that while cyclists have lower body fat and there are a myriad of health benefits to cycling, cyclists are more likely to have osteoporosis or near-osteoporosis. Why? because serious cyclists often spend many hours per week cycling, a non-impact activity, and not enough time on impact sports like weight lifting or running. Research seems to show that impact exercise makes bones stronger.
The message is that we cyclists should spend some time running or hitting the gym.