As kid I used to enjoy hanging upside down from upholstered furniture, though mother would yell at me not to ruin her antiques (the chairs or couch). Never been able to do the handstand/headstand posture, so that's out. Nowadays, for whatever reason, being upside down makes me feel ill & dizzy-I used to enjoy the "headrush" but that was in childhood. I do like the sensation of balancing out pressure on/within my entire body, so I'm not weighing on my feet/legs-every once in a while I hang halfway off edge of my bed, with my lower limbs elevated, to get the blood moving.
Now & back then: Swimming is where I have most fun upending self, doing somersaults, and still not getting motion-sickness (which I'm susceptible to in cars, etc.).
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*"I don't know what it is, but I know what it isn't."*