Somatics, a method of reminding your mind to release the muscles. Muscles aren't "tight" or "hard" on there own. If they feel this way it is because they are engaged. One thing engages muscles, an electrical signal sent from the brain. Remind the mind how to turn off the signal and the muscle goes to its relaxed state. (Hint, cats and dogs do what it takes to remind their mind of this about every time they get up and start to move.)
"Stretching" works against this and in some cases can be the cause of additional injury.
GREAT THREAD Sean!