Dolphin Plank:
Lie face down with your toes tucked in. Keep your forearms on floor using them as levers, pull your bellybutton in towards your spine using your abs muscles, and make a position of a low plank by raising your hips. Lift your hips further and inhale so body forms an inverted V; pause, and then slowly go back to starting position. Do 4 sets of 10 reps. The Dolphin Plank works on your back, abs, and shoulders.