Start with your belly on a stability ball, with your legs straight and your hands and toes touching the floor. Shift your weight to your arms and upper abs balanced on the ball. Contract your butt and core to help raise your legs up into a prone position. Hold a moment in the raised position before returning. Repeat.
Do this exercise with the best exercise equipment. We recommend using a bluetooth chest strap heart rate monitor or a smartwatch for more training optimization & performance tracking.