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Fuck jumping on trampolines, I had knee surgery two days ago because of them.
Seriously though they can be good practice for body composure and air control but weight is necessary, and the tricks you learn on them will feel different do to your forward momentum and other factors while skiing.
I broke my cheekbone last saturday on a tramp in 3 places and had surgery two days ago. DON'T JUMP ON TRAMPS IN THE DARK KIDS!!! haha but i learn how to throw a trick on a tramp and after i get comfortable with the rotation I try it on snow. Some tricks are harder on snow and some tricks are harder on the tramp.