http://www.cincinnatichildrens.org/he... Wide Leg Plank with a Shoulder Tap is a great exercise to help strengthen the upper extremities and core strength. This full-body exercise can help prevent injuries and improve shoulder stability. Follow along to the instructions in the video. All you need is your body and a flat surface. Medical Disclaimer: Consult your physician before beginning any exercise program. This general information is not intended to diagnose any medical condition. If you experience any pain or difficulty with these exercises, stop and consult your healthcare provider.