You will know after analyzing the principle.
There are only two states of muscle fibers, contraction and relaxation. Exercise is a process of repeated contraction, relaxation, injury and regeneration of muscle fibers. Therefore, from the perspective of muscle fiber, it contracts when doing work and relaxes when relaxing. So the purpose of relaxation is to relax muscle fibers as much as possible.
There are two ways to relax muscles, one is active relaxation and the other is passive relaxation. The method of active relaxation is to exert reverse force after exercise, forcing muscle fibers to relax passively, which is widely used for athletes to recover quickly; Passive relaxation is a routine relaxation method, such as shaking and resting.
Take push-ups and dumbbell push-ups as examples. Exercise is to contract pectoralis major as much as possible, and relaxation is to relax pectoralis major as much as possible. You can put your hands straight behind your back and raise them as much as possible. It's better to have help. At this time, pectoralis major is in the state of maximum relaxation, which is very helpful for relaxation.
Other parts of the muscles can also be handled according to this, which is nothing more than finding the reverse relaxation action of the muscles to be exercised. This effect is obvious, and it has a miraculous effect on increasing the rapid recovery of muscles. Might as well try.