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Start in a bridge position — that is faceup with your feet planted and legs together, your knees bent to 90 degrees, and your hips elevated so only your head and shoulders are in contact with the floor. Your arms should be on the floor with your elbows straight. (If you can touch your heels with your hands, you are in a good position.) Hold the bridge for a five-count, then lower your hips slowly to the floor. Next, put your hands loosely behind your head and perform a crunch. Return to the bridge position and repeat the sequence.