[[R21]] Indications: Rheumatism and toxic gas in the feet and knees, hot mouth and dry tongue, swollen throat, upper qi, irritability, heart pain, dampness under Yin, etc. Exercise method: Stand up between 23 and 3 a.m. every day. Stand with your feet about shoulder-width apart to the left and right, slightly bend your knees, extend your arms straight and out at level, with your palms facing outward and your fingertips pointing upwards. Lift your legs and walk in place for a few steps. Then, clench your teeth, swallow saliva and breathe in and out. The method is the same as before.