This move will really help to tone not only your chest, but your core as well. It's a great way to work new muscles and target that tricky underarm area!
Step 1: Hold a pair of dumbbells and lie back on a stability ball, (make sure your head, neck and shoulders are supported by the ball) with your feet flat on the floor, knees bent at 90-degree angles, ankles directly under your knees and hips lifted upward with abs tight.
Step 2: While keeping this body position, push weights straight up and open arms out wide to your sides so they are parallel to the floor. Your arms should be straight without locking the elbows. Bring your arms back to the center and repeat as many times as you can for 60 seconds.
Modification (Beginner): Remove ball and lie on floor.