Hi Mighty,
only very gentle rebounding is necessary to receive its benefits......I wouldn't treat it as an Olympic competition as to who can bounce the highest!!
The 'health bounce' as it is called is the most efficient means to move lymph. It consists of gentle up-and-down bounce movements, standing upright, where your feet just barely come off the trampoline mat. http://www.holistichealthtools.com/rebound.html
It is the only exercise recommended by NASA for their astronauts, and is reported to be approx' 68% more efficient than jogging.
It is the only exercise that I do personally as it fulfills all of the requirements of exercise in one hit.............
# Strength
# Aerobic capability
# Flexibility
# Endurance.
# Detoxification.