Getting into a deep squat is great after doing squats or deadlifts at the gym. This will help stretch the thoracolumbar fascia and the lumbar paraspinal muscles. If you can not get into the deep squat use a yoga mat under your ankles. Overtime you will be able to get into the deep squat. You can also hold onto a door frame in front of you if you feel like you are going to tip backwards.
Do 3x, 30 seconds each.