A straight-leg forward bend does double duty as a stretch for both your hamstrings and your low back. Start with your feet together or hip-width apart, knees slightly bent. Bend forward at the waist until you feel a comfortable stretch along the back of your thighs. Allow your belly to rest on your thighs to support your low back, and relax your neck. If possible, straighten, but don’t lock, your knees. Allow your arms to dangle toward the floor. Hold this position for 30 seconds to one minute. To release the stretch, bend your knees and slowly roll up out of the forward bend.