ALEXANDRIA, Va., Aug. 20 -- United States Patent no. 12,390,686, issued on Aug. 19, was assigned to True Fitness Technology Inc. (O'Fallon, Mo.).
"Abdominal crunch exercise machine" was invented by Jared Kueker (St. Charles, Mo.).
According to the abstract* released by the U.S. Patent & Trademark Office: "An exercise machine, components of the exercise machine, and methods related to using the exercise machine that allow for a performance of an abdominal exercise which provides for a more natural rolling motion for a back of a user while providing variable resistance. Specifically, at least one of a seat or a backrest of the exercise machine, and preferably both, is not rotationally attached directly to a frame of the exercise machine, bu...