Thats a hard one. Either Jumping on my trampoline, or skateboarding. Hell, I'll go with the one I'm better at: Jumping on a trampoline. I'm actually not half bad either, I can do a filp in any direction (front, back, or side) I can combo decently, and I can do opposite flips (Basically, moving in the opposite direction of your flip, so while flipping frontwards, your moving backwards.). Yeah, trampolines are definitely fun :D