ALEXANDRIA, Va., Aug. 20 -- United States Patent no. 12,390,685, issued on Aug. 19.
"Multifunctional core training device" was invented by Lung-Fei Chuang (Taichung, Taiwan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A multifunctional core training device includes a first frame body, a second frame body, a holding device, two elastic elements, two forcing elements, a sliding structure, and a switch. The second frame body is pivotally disposed on the first frame body. The holding device is disposed on the first frame body. The two elastic elements are disposed on the first frame body. The two forcing elements are respectively connected to the two elastic elements. The sliding structure is movably disposed ...