Good evening, Tworpish, and welcome to Line of Action, and how are you doing tonight?
Nicest job on your well articulated bones and muscles of your hand gestures and poses, but I'm not getting enough of the most boldest and most powerful gestures and movements. How would you please free up your range of fluidity and flow of your gestures and poses with 5 minutes of 1 minute hands and feet?
The reason why is as a result of your goal to make your hands and feet less rigidest, and the most spontaneous, fluid, and flowing, then I encourage and validate you to do that. If you're completely and totally curious of gesture drawing of hands and feet, then I suggest you look into the Andrew Loomis books, Figure Drawing for All It's Worth, and Drawing the Head and Hands.
Good luck, and my hat's off to you.