Looking for a fun a challenging way to work your abs and upper body at the same time? Then check out this move using an exercise ball.

To find out how to add some ab work to your push-ups, just .

• Place your belly on a ball and walk your hands out so the ball is under your shins.
• Now bend your elbows and slowly lower your chest to the floor, doing a push-up.
• Then straighten your arms and draw your knees forward into your chest. This will send your pelvis up and bring the ball closer to your face.
• Extend your legs straight back, and repeat this sequence for a total of 15 to 20 times.

I feel so tough after doing this exercise, do you?