Squat deeply but comfortably on the ground, with your hands in front of you, free to work at ground level, as if you're a caveman chipping stones or digging for roots. Maintain this position for a minute, then do a "chimp shuffle." With your hands on the ground, shift your body a few feet to the left or right, then settle back into the squat. Repeat until you get a rhythm. This helps increase flexibility in the hips, hip abductors, and hamstrings, and relieves back pain caused by excess sitting.