Grab a pair of 8- to 10-pound dumbbells and lie faceup on an exercise bench, knees bent with feet flat on the bench. Hold the dumbbells above your chest (A). Press them straight up while bracing your ...

The crunch is a classic ab exercise. It’s also pretty straightforward: Lie on your back with your knees bent and feet flat on the floor, contract your abdominals, and lift your shoulders, neck, and ...