How to Do It

Lie supine on exercise ball with shoulders and head supported on the ball, and with butt and abs tight to form a bridge. Start with weights directly over chest, elbows soft. Slowly bend elbows and lower arms until your elbows are at 90 degree angles, using your legs, back and abs to balance on the ball. Press arms straight without locking, then lower back to starting position.
Use enough weight/resistance that you can ONLY complete the desired number of repetitions. If you are lifting heavy, use a spotter!

This exercise works the chest, arms and shoulders, as well as the back, glutes and abs.