US Patent 10543394 Doughnut shaped multifunction cushioning device

A doughnut shaped multifunction cushioning device, made of foam or similar flexible resilient material, and having a doughnut hole contoured recess. During exercise, manual labor, or other human endeavor, one human body joint such as a knee or other bodily bony protuberance is placed inside the contoured recess and against the floor or other support surface. By such means the cushioning device provides one or more of the following beneficial effects: reduced risk of injury, increased comfort, body alignment, and slight traction.