ALEXANDRIA, Va., June 12 -- United States Patent no. 12,296,223, issued on May 13.
"Lumbar exercise machine" was invented by William G. Robinson (Wayzata, Minn.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A portable exercise machine useable for isometric exercise and conditioning of the multifidus muscle has a seat with an adjustable upwardly inclined arm member and an adjustable downwardly inclined leg member. A handle connected to the arm member is adapted to be gripped by the user to perform static muscle contraction and stretching. A foot rest connected to the leg member allows the user's heels to rotate downwardly forcing the pelvis to lock and isolate the multifidus muscle for stretching and strengt...