V-Ups (Weighted Suitcase Crunch)

1. Start with lying on your back with your feet all the way up, toes point to the sky (like a V).
2. Come up and touch your toes with your first two fingers
3. Come back down and have your shoulder blades graze the ground
4. As soon as your shoulder blades graze the ground, perform the next repetition.

See video here.