Bouncing, jumping and core balancing in trampoline class

Jumping fitness is a low-impact workout on trampolines.

The real work of Jumping fitness comes not just from bouncing and lifting your legs and knees high, which blasts the butt and hamstrings, but keeping your torso and head low, which rips the abs.

Jumping class is some serious bouncing around. Jakub Novotny, left, leads a group at Jumping Fitness in Redondo Beach.  (Allen J. Schaben / Los Angeles Times)