This exercise is a little bit harder than the same performed on your elbows. Come into a side plank position on your hand. Your feet are stacked on top of each other. If you are struggling with the balance, place the upper foot on the ground in front of the lower foot. Stretch the arm on top to the sky above your shoulder, bend it and bring it underneath your rib cage. Keep your chest proud and try not to move your butt away.