AskTheTrainer.com Michael Behnken, MS, NASM-CPT-PES, CSCS is a San Francisco Based Personal Trainer This a great exercise for your core. This is a static hold, you must maintain core stabilization by drawing in the core and contracting the glutes. Hold the medicine ball for a little more work on shoulder stabilization. Medicine balls are a very good tool to get for home or gym use. For tons of more workout, weight training, diet, nutrition and supplement information which is honest and not ...