What is the best way to: How do I do sit ups

Options:
* Lay your ear against the ground, bring your knees up to a 90 degree angle then go up and down against your legs back to the ground;
* Lay your back against the ground, bring your knees up to a 90 degree angle then go up and down against your legs back to the ground;
Answer:
Lay your back against the ground, bring your knees up to a 90 degree angle then go up and down against your legs back to the ground