Stability Ball Pikes
Begin in a plank/push-up position with your feet up on a stability ball.
Make sure the center of the ball is at the center of your shins.
Contracting your core and keeping your arms locked tight, pull up through your belly button, lifiting your hips into the air.
This will pull the ball in closer to your body, causing you to be inverted (in an upside-down V, looking behind you).
Squeeze tight at the top of the contraction, then slowly lower yourself down to the starting plank position, holding your core through the entire move. Repeat 10-15x for 3 rounds.
This is a great addition to your current ab routine or a great finisher at the end of a chest and shoulder workout.