Exercise exceeds muscle load, causing muscle anaerobic breathing and producing lactic acid. To put it bluntly, it is excessive exercise. Be sure to stretch after strenuous exercise, so that the muscles can stretch better, including the muscles of the calf.

Leg muscle stretching method:

After exercise, the foot touches the ground, and the forefoot leans against the wall or other objects. When you lean forward, you will obviously feel the stretching feeling of the calf muscles. Stretching your legs apart will relieve the pain. Massage the calf muscles after stretching, so that the muscles piled up together can be stretched better. You can also massage the calf muscles by hand, which will also have an effect.