Add this classic move to your workout routine for an all-around body burner:
While lying face down, place forearms on the floor, with either palms face down or hands together.

Raise off the ground onto toes and elbows, firing your glutes.

Keep back flat by engaging abdominal muscles, and be sure to not raise your rear or sag your middle to the ground.
Hold for 30-60 seconds, repeating 1-3 times.