Often the shin bows outward due to the stress from running or athletics. Have you been a runner? If you are, practice Hero Pose (Virasana) before and after each run. This will help maintain elasticity in your feet and ankles for the squat position and will give a much-needed stretch to the muscles along the front of your body—in particular the quadriceps and psoas muscles.
Precautions: Knee or ankle injury: Avoid this pose unless you have the assistance of an experienced instructor.
Stretches the thighs, knees, and ankles
Strengthens the arches
Improves digestion and relieves gas
Helps relieve the symptoms of menopause
Reduces swelling of the legs during pregnancy (through second trimester)
Therapeutic for high blood pressure and asthma