Inversions bathe the endocrine organs (pituitary gland, thyroid and parathyroid) in blood meaning they are allowed to do what they’re supposed to do. Cleansing and repair happen and proper function returns or is maintained. The increased blood flow to the head includes the brain, the part of the body that uses the greatest blood supply. The morning wake up I do with headstands pushes blood up then down my body repeatedly as I shift my space in gravity.
Reading Anatomy of Hatha Yoga I was surprised to find out he listed two different versions of headstand, one at bregma, another at the crown. Exploring the pose over time I became aware that my skull wasn’t completely level and my neck was certainly not in proper alignment. I’d been told that headstand is a bad idea for someone with my specific injury, a whiplash. I wondered why the pose made me feel better and decided to listen to my body as opposed to stop doing a pose I liked.
I realized over time that headstand gave me space to correct cervical spine issues from the top down. By shifting my head slightly in various directions I had resistance to push into the muscles around my neck, connecting into the base of my skull and into my upper back. I could essentially work in three dimensions and now upside down to reverse any structrual torsion or shift that’d taken place over time. Long story short, not only was headstand good but I could work on my long term alignment in some tricky areas.