Crunch

1. Your legs and feet remain motionless when you move your shoulders up. (90 degrees)
   

2. Your lower back remains stable and under tension.

3. Roll your upper back a little while moving your chest towards the knee.

4. Always keep the head in extension of the spine.

5. Hold the contraction for a brief moment in the final position.

6. Then slowly sink back, so that you always stay energized.