Work the front and side of your abs with no equipment.
Lie on a mat, on your left side. Prop left elbow directly under left shoulder, as shown. Keep head and neck lifted. Raise left hip away from the floor so your left elbow and foot support your weight. Hold for a count of three, then lower to start position. After 30 seconds, switch sides. To decrease difficulty: Bend knees to a 90- degree angle. When you lift, support your body with your elbow and knees.