The main joints of the body are filled with synovial fluid, which acts as a lubricant and helps keep joints moving smoothly. When considering this in light of rebounding it’s worthwhile to note, the action of bouncing (on proper equipment) gets your joints and muscles working with and against gravity. This gives you an effective stress-free workout. As a bonus, rebounding creates an exercise synergy; not only do your joints and muscles get a low-impact, vigorous workout, but your joints get lubricated and you rev up your heart and lymph system, too
While bouncing, try to be constantly aware of your body position in relation to the frame. This can be accomplished by exercising in front of a mirror and by occasionally glancing down to check position.
When bouncing, avoid bouncing too high or out of control (feet should never leave more than two inches off mat) and keeping the head erect and the eyes forward. Keeping low will better control the bounce. Focusing the eyes on a stationary object across the room may further help to regulate your bounce.
Repeatedly land each bounce focusing on pressing down versus jumping up. Not all movements start and end in the middle of the mat. Maintaining good bounce control is more important than jump height, in fact many exercises do not require your feet leave the mat.