BONES and MUSCLES 

when we ski we use: calf muscles,biceps,triceps,femur,ulna,radius and patella.https://www.youtube.com/watch?x-yt-ts=1422411861&v=3zD1ZRK2LUUx-yt-cl=84924572&feature=player_detailpage#t=24

when we snowboard we use:calf muscles,,patella and tarpians

https://www.youtube.com/watch?v=SEDitXT51M4#t=36

when we cycle we use our,calf muscles,femur,triceps patella and knees