That's a really interesting exercise! I have tried out this exercise that you shared with me. If I tense my left hand as much as I can, then it feels heavy If I relax it, it feels light like a feather If I do both at the same time then it my hand sometimes experiences a constant feeling which is somewhere between heavy and light. But other times when I try it, this feeling flickers every second, in the sense of that it tries to tense as much as possible and a second later completely relax, so that the feeling is not constant anymore (rather it switches between very heavy to very light) Do you experience the same thing? What do you experience exactly? What can we learn from this? How can this lead to freezing responses, or stuttering? Hope to hearing from you.