Hip flexors - Restores upright posture in the lumbar spine. Place your left knee on the floor and your right foot out in front of you. Position your hips in neutral (back not arched or rounded), draw your belly button in and tighten your right glute. You'll feel the stretch in your right upper thigh. For a deeper stretch, lean forwards. Hold for 20 to 30 seconds, then switch legs. Repeat twice.


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