5. Skydiver with arms in T-position
Lie on your stomach, your legs are spread more than shoulder-width apart, feet are feet up.
Your arms are stretched and form a T with your upper body. Now, underbody tension, lift your upper body with arms and legs as far as you can. Next, turn your thumbs towards the ceiling and pull your shoulder blades together.
While you lift all limbs in the air, bring your legs together and then spread them apart again and steadily in the air.
For the following few repetitions, you only move your legs open and closed.