The second type is to climb a bike lying flat in the air, each group 100 times, and do three groups. Do it at different times a day, and the best total amount is about 1000 times.
Third, find a stool and sit in the third position, with your legs together and straight. Keep your legs straight at 90 degrees to your body for 30 seconds and slowly put them down. A group of ten people
Fourth. Feet are shoulder width apart. Stand on tiptoe with physical strength, hold for 30 seconds, and slowly put it down. Ten groups, three groups at a time.