The fatigue part comes from using a form in such a way where we get caught between what we think the form is and how we should relate to the form. Some of our neurosis comes up and keeps us from seeing how to relate directly to the form. Relating to those forms means you’re also relating to your own body-mind complex as clearly as you can.
https://www.youtube.com/watch?v=Vr2MJ0aANTM