Aloha delsha,
Tendons, bones, organs...it's all energy holding a certain pattern and a certain time, space and speed. Spring Forest Qigong works with the underlying energy of that which we perceive as solid, and brings it back into balance and optimal flow for the person.
It's working on that yin or spiritual aspect of the energy and then the yang or physical energy follows suit afterwards. This is why you can do the exercises and meditations to open the channels, but a physical response may or may not follow right away.
Much Love, Shawn