Understanding tension and relaxation is one main element of my teaching this year. Most peoples practice is missing the relaxation element. Especially young males walk around with a lot of unnecessary tension. This can lead to injury, hurts your communication and takes a lot of energy. You will lose all your tension in a survival situation and tense your muscles only as much as you need, but in the city people have a lot of tension, some because of what they do physically, some because of fear or anxiety. Relax. That's the message here.
You can find an introduction into the topic with an exercise on my youtube channel. Video is called "Entspannung - Einführung und eine Übung - Relaxation", it comes with English subtitles.