The Swiss ball tuck exercise is great workout that focuses on your chest and abs while simultaneously improving overall core muscle strength, balance, and concentration.
Step 1. Start in a plank position with hands underneath shoulders and feet resting on top of the ball.
Step 2. Slowly bring your knees in towards your chest, lifting your hips slightly to allow the ball to come underneath you.
Step 3. Extend your legs back out ensuring your hips remain up, keeping your back straight and core tight.