Have you ever thought of using a folding chair when performing abdominal crunches? Try it. You’ll find that it’s a comfortable way to focus on contracting your abs without feeling pressure on your back.
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STEP-1. Place an open-back chair or bench on a flat, padded surface and lie down in front of it. Place your lower legs on the seat of the chair with your feet hanging off the back end of the seat. Scoot in so your hips are close to the chair. Place your hands behind your head with your elbows pointed out to the sides. Inhale, allowing your abdomen and rib cage to rise slightly.
STEP-2. On an exhale, push your back firmly against the floor as you contract your abdominal muscles to raise your chest, shoulders and head off the floor. Pause for two seconds with the front of your ribs and navel pressed toward the floor. Remember to rest your head in your hands so your neck and shoulders can stay relaxed. Lower and repeat 15 to 20 reps. Rest 20 seconds and repeat another set.
Source: Los Angeles Times