Why do it?Strengthens the lower back and glutes
How to do it:
Step 1: Lie face down on your stomach with arms and legs extended.
Step 2: Keeping your arms and legs straight (but not locked) and torso stationary, simultaneously lift your arms and legs up toward the ceiling. Try to lift your arms and legs as far off the floor as possible while keep the proper form. Your back should arch.
Step 3: Hold for two to five seconds and slowly lower back down to complete one.
Image from: fitsugar.com
Find an exercise...