Pelvic Tilt Into Bridge
Main muscle: Lower back
Mechanics type: compound
Fitness level: intermediate
Category: Stretching

  1. Lie down with your feet on the floor, heels directly under your knees.
  2. Lift only your tailbone to the ceiling to stretch your lower back. (Don't lift the entire spine yet.) Pull in your stomach.
  3. To go into a bridge, lift the entire spine except the neck.

Source: bodybuilding.com