Crunch Core Exercise
Crunches are one of the best core exercises. The starting position for crunches is lying flat on the ground with hands behind the head and feet flat on the floor about a shoulder width apart. The crunch exercise is done by contracting abdominal muscles to lift the head, shoulder, and arms off the ground upward and towards the legs slightly. Exhale while rising, and inhale while returning towards the floor. I would suggest 10 crunches the first time. Each crunch exercise can be held for 2 seconds. In future weeks, crunches can be held 5 seconds.

Crunch Core Exercise part 1 with Sarah

Crunch Core Exercise part 2 with Sarah