Find a problem, do dumbbell bending and other anaerobic exercises?

Not only anaerobic exercise is like this, but almost all activities in life are like this, which is a psychological activity. When you focus on a certain point, you will unconsciously have some hints, such as running, thinking about running 500 meters to complete your goal. When you get close to your goal, you will feel very tired and can't wait to arrive at once and have a good rest. But when you set your goal at 800 meters, you will still be in good shape. After 700 meters, you will get more and more tired and can't wait to arrive at once. If you listen to Degang Guo's dirty jokes while running, you will unconsciously exceed the preset goal, and you won't feel tired because your attention is diverted.