Weight bearing exercise. You do not have weight bearing on you on a bike. Your weight is bearing on the bike. Get off the bike and run, do yoga, play basketball...these will make you bear your weight. Remember high impact/low impact aerobics? The impact is on YOUR body. Stop trying to say that biking is weight bearing. It is NOT. Pro cyclists have know for years that this is an issue in their sport. Why is it being debated on here?

Cycling is NOT weight-bearing exercise. If you want to have healthy bones for years and years, do WEIGHT BEARING EXERCISE in addition to your cycling!