I confuse “inversion therapy” with “aversion therapy.”

The latter (“aversion therapy”) is where you train your dog not to leave your yard, or not dig, or not bark, with a collar that shocks the dog when it does run off, dig, or bark.

“Inversion therapy” helps alleviate back and neck pain by taking the usual gravitational press we live with and literally “standing it on its head.” One method is to strap your feet into boots and hang upside down like a big bat. Rosie O’Donnell once did this on the Ellen DeGeneres Show, I think. Another method is to strap your whole body to a flat surface that then completely flips upside down, the body suspended head down, feet in the air.

Inversion advocates claim when you exercise while in this upside down position — in other words, when you do sit-ups …