So i can do alot of different flips and good handstands. But for some reason i cannot do a round off or a cartwheel to save my life. I step properly , place my right hand with my fingers facing my left leg and my left hand's fingers facing right. My legs can never seem to come straight or come together until the very end of the flip. I mainly practice on my trampoline, but i cant grasp to concept of shrugging my shoulders at all. I always remove 1 hand from the ground at a time and my left hand usually is still touching the ground when my legs land. Can someone please run me through the trick and explain to me what im doing wrong?