| 摘要 |
A portable support system that utilizes a doorway frame to allow a person to perform various inversion exercises without any modification or marring to the doorway frame and also without the use of gravity boots (ankle device U.S. Pat. No. 3,380,447 granted to Martin). Previous patented door frame support systems (U.S. Pat. No. 3,738,650 granted to Ossenkop et al, and U.S. Pat. No. 4,458,894 granted to Dudley) have required modifications to the door frame, such as mounting brackets screwed into the frame. The person also has to possess gravity boots (ankle device U.S. Pat. No. 3,380,447 granted to Martin) in order to perform inverted exercises. This invention eliminates both of these problems.
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