9)Wide three-point leg scissors: Hard
Get into the push-up position; your shoulders are directly over your hands, your feet are more than shoulder-width apart.
Pull your belly button towards and squeeze your abdominal muscles.
Raise your left foot about five inches off the floor. The toes point straight down. Do not move your hips.
Throughout the exercise, your body forms a straight line from your head to your heels.
Now move your left foot to the right foot, return to the starting position, and repeat the exercise with the right leg.
All the time, there should be no movement in your upper body or hips.