Easy to do back and ab curls

This is your half sit-up.

Lie on your back, knees bent, feet on the floor.

Place your hands behind your head (more towards the neck) with your fingers linked.

Don't let your chin touch your chest. Keep your head in a comfortable position. Elbows must stay out to the side.

Contract your abdominal muscles and raise your upper body until the shoulders blades come off the floor (don't let your elbows bend forward when you do this).

Lower yourself until your head almost touches the floor. Don't let your head and arms rest on the floor; lift yourself up again just before they do.

Exhale as you lift and inhale as you lower.

Start off with one set of 16 repetitions. Gradually progress to two sets and so on.