1. Place your hands flat on the floor slightly wider than shoulder width apart
2. Fully extend your legs out so that only your toes and/or balls of your feet touch the floor
3. Keeping your back nice and straight, brace your core and lift one hand up across your body to touch the shoulder on the opposing side
4. Place your hand back down to the floor, redistributing the weight before continuing on the opposing side
The primary muscles used in Plank Shoulder Taps are the Abs and Chest. The secondary muscles used are the Shoulders.