You can use stretching exercises and some flapping exercises to relieve muscle tension first.

Many athletes and coaches in gyms are prone to muscle tension or excessive tension, especially on their arms. So they do flapping and stretching.

This has a particularly good effect on relaxing the muscles of the arms and calves. And the operation is simple, basically not limited by space and region, so everyone will use this method to relax the muscles of the upper arm.

Secondly, take a relaxing bath.

Some people like to take a bath when their muscles are tense. Bathing can improve the blood circulation speed in the body, accelerate the metabolism in muscles, improve fatigue, deliver more blood and nutrients to tight muscles, and help to relax muscles.

But this method can only be done at home. Outside, there is no bathtub or hot water. This has a position limit. Not as simple and free as the one above.