Finish the following sentence with the best choice: How do I do sit ups

Choices:
- 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