Ice Skating- you want to have a good speed going to the jump, but not try to speed up or slow down right before take off. You want to remain in compleate control of your body in the air, and land at the same speed you took off at. You also have to really train yourself in body awarness, so you can isolate different parts of you body at a time.
Snowboarding- You have to aproch the jump at the exact line you see, and ride that line at a steady pace, then you have to stay intotal control in the air, balancing in a flip or twist.
What other sports(anything) can you compare to riding?