How about patented intelligent backpack orthosis?

Writing on your head, leaning against the wall, wearing high heels and pulling the horizontal bar are all really useful. In particular, heel shoes are invention patents audited by the state, as well as stretching and doing experiments at rest: barefoot, stepping on a book 2 cm thick with the forefoot and following the ground. See if there is any change in the position of the center of gravity and whether the back is straight. If the basic test simulates negative heel shoes, you can move the center of gravity back to the heel position and keep your back straight.