Bike rides are nice (maybe the best?) but not everyone is the same. My mother in law is awaiting hip surgery after a lifetime of being physically active. Her hu

Bike rides are nice (maybe the best?) but not everyone is the same. My mother in law is awaiting hip surgery after a lifetime of being physically active. Her husband, who lived the same life, is older, has no such problems. Of course genetics plays a part, that's the point.