4 Ball Push-Up
For chest, core, and triceps
Kneel with a stability ball in front of you, then walk hands forward, rolling up on the ball until it’s beneath your thighs. (Your body should be in a straight line, with your hands directly beneath your shoulders.) Bend your arms and lower your body until your nose almost touches the floor. Straighten your arms to complete 1 rep. Do 3 sets of 10-12 reps, resting for 30 seconds between sets.
Trainer tip: To protect your back, don’t let your hips sag. Mastered this move? Try it with the ball beneath your shins instead of your thighs.