Standing Head to Knee: The first of the 3 one-legged balancing postures, it deepens concentration and determination by requiring the infamous Bikram "locked knee." Tightens abdominal, back, thigh, hip, bicep, and tricep muscles. Creates front side compression squeezing out toxins from abdominal organs. Improbes sciatic nerve flexibility. Strengthens tendons and muscles. Great for the cardiovascular system.