For the last month I've been experimenting with what I would call Marrow Breathing Meditation. It's a technique of meditation where you use your breath to connect with the marrow in your bones and use it to generate Chi and more blood cells. I learned about it when I read a book on Qigong practices that focused on this topic. While the book was mostly theoretical, I have enough experience with Taoist meditation practices that it wasn't hard to figure out how it should work and adapt my practices to explore if the marrow breathing meditation could work.