I am a new rider (September 07). My 1 st bike is a cruiser and I just bought a second bike for the garage GSX750F. Now I have been doing a fair bit of riding in the last week and my leg muscles are still letting me know. When I ride the cruiser you definitely have to hang on more (not to get blown off) - that one gives my arm/back muscle workout. Is it just my muscles getting toned or am I just to old ?