To practice HS, choose two sections to practice, one for each hand. Practice one hand and switch hands as soon as the working hand gets tired. In this way, you can work hard 100% of the time without fatigue because one hand is always resting. When a hand that had been working hard is rested, it is initially tired and sluggish. As it rests, it recovers and becomes re- energized and eager to play — this is the best time to switch hands because it can perform miracles. Rest it longer, and it will cool off and become sluggish again. Thus you must learn from experience, the best time to switch hands; the shortest times are about 10 seconds. Depending on the conditioning of the hands, the degree of difficulty, etc., this rest time can be longer. The best switching time is the shorter of the optimum rest time of the resting hand and the "tiring time" of the working hand.