| 摘要 |
PROBLEM TO BE SOLVED: To provide an instrument for training abdominal muscles, which is operated with less back muscle strength compared with a conventional method with the use of the bearing type seesaw mechanism of the instrument when doing exercises since it is difficult for a person with feeble muscles, especially, an aged person, a woman, or a child, to perform training as the large back muscle strength is required in training the abdominal muscles, etc., and which is lightweight and excellently portable without neither requiring a large floor area nor damaging a floor or a carpet, is inexpensive in price and mailing cost, and is suitable for a mail-order service. SOLUTION: The abdominal part of a user is put on a top board (01) with a cushion material (02) stuck thereon. The user easily sits up with the back muscle strength being extremely smaller than that required in the conventional method even when the user is an oriental person with a longer body through the use of the bearing type seesaw mechanism which includes: a top board beam (10); a hinge axis (06); axis positioning brackets (05), (08); a snap ring or color metallic material (07); a base board beam (11); a base board (03); and a cushion material (04). Thus, even the person with the feeble muscles easily and repetitively trains the abdominal muscles, etc., without requiring much strength and obtains a desired effect. COPYRIGHT: (C)2007,JPO&INPIT
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