This is a beginner exercise but very effective if it is done properly because it strengthens your upper abdominals.
Sit Up Step by Step
- Get on your back and cross your arms.
- Now raise your upper body contracting your abs.
- Have your elbows touch your knees or mid thigs to count.
- Now go back and repeat.
- Do not rest on your back
- Do not arch your lower back
- Do not bounce off the floor.