For beginners: Lay on your right side with your legs straight and rest on your right forearm. Your elbow should be in line with your shoulder. Bend your left knee and bring your left foot flat onto the floor in front of your right leg, with your toes pointing forward. Engage your core and lift your hips off the ground. Imagine your body is between two panes of glass; you want to avoid wobbling forward, but you don’t want your hips to droop. Hold for 20 seconds. Work up to being able to hold the side plank for 60 seconds. Repeat on the other side.