I ride everything I have a chance too. While I ride MX, I mostly roll the jumps because I have no idea how to land. I think I own as many motorcycles as I do pinball machines.
Riding MX is the best exercise too. My latest acquisition is a 04 Suzuki RMZ two fiddy. Over the winter I completed a restore on a 1996 Yamaha YZ125. Both are a blast to ride.