5. Reverse Plank:
Sit on the floor with
your legs extended straight in front of you and your palms on the ground just
outside your hips. Press your hands into the floor and lift yourself up by
contracting your hamstrings, glutes and other posterior musculature. Drop your
head back, press your chest up and try to look behind you. You’ll wind up
looking like an upside-down plank. Hold this position for time.