Hip Clearances are great for getting range of motion in the hips. This frees the joint up giving it room to move and enabling you to perform exercises more proficiently. It also helps to relieve lower back pain by taking any excess load and rotation away from the lumbar spine.
Start with 1 set of 10 with your hands on the ground. Progress with 1 set of 10 with hands out in front of you. Try to keep your hands at shoulder height, this will help you keep your chest up and thoracic spine tall.