After finding the piriformis muscle place the release ball onto it. Then straighten the leg and lean over with your weight on the muscle and roll onto it. Roll slowly back and forth on the ball finding that Sweet Spot. Continue rolling for about 2-3 minutes and then switch over to the other side doing 2-3 sets. This release technique can help with tightness or disfunction in the sacroiliac joint, lower back, hips, sciatica.