What is curl-up (arms extended)?

Curl-up (arms extended)

1. Lie on your back with your knees bent, feet resting on the floor. Keep your arms at your sides.
2. Slowly tighten your belly muscles and raise your head and shoulder blades off the floor. At the same time, raise your arms to about thigh level.
3. Keep your neck straight and do not press your chin to your chest.
4. Hold for 1 or 2 seconds. Then slowly lower yourself back to the floor.
5. Repeat 8 to 12 times.