Running is so tiring that the whole person is dying, but he still insists on running. People who can't start running from 800 meters can't keep running 10 km for 58 minutes. Now sit-ups are difficult from ten to three hundred, and I don't feel tired after more than 60 minutes. In the cold season of March and April, it is not a problem to wet two or three sheets of A4 paper with sweat every night. My friend said that nothing is impossible for a woman who can lose 40 pounds of meat in just three months. It can be said that it is difficult for yourself.