Well, whatever activity you do, if your whole purpose in life is drinking beer, you'll be fat and unhealthy. Sadly, there are many bikers (NOT motorcyclists) whose whole purpose is drinking beer. But that's not riding a motorcycle, that's bar-hopping.

Bicycling has become the cross-training activity of choice among motorcyclists, and many pro motorcyclists train side-by-side with pro bicyclists. That's what kind of cardio condition they have to be in.

Spend a few hours in the twisties and then tell me how your muscles feel....