The present invention enables the user to directly adjust the hip joint motion range while inducing a shock absorbing effect of the left and right swings of the saddle and distributed loads when pedaling by seating on the health bike saddle, thereby providing stability against pelvic and spine movements during pedaling. It relates to a structure for adjusting the left and right swing width and rotation of a health bike saddle that secures and enables the lower body exercise and core muscle training at the same time when pedaling.It is disposed on the bottom of the saddle member 8 and distributed by the user's pedaling motion. A buffer unit 100 to alleviate the left and right shaking; A left and right movable unit 200 coupled with the buffer unit to perform a left and right sliding operation; A front-rear moving part 300 coupled to the left-right moving part 200 to perform a front-rear sliding operation; It consists of an eccentric rotation unit 400, which is coupled to the left and right movement unit 200 and the front and rear movement unit 300 and rotates eccentrically to simultaneously control the sliding operation of each movement unit, but the eccentric rotation radius of the eccentric rotation unit 400 is the user's It is possible to expand or contract according to the selection, and to the left and right swing width adjustment and rotation structure of the health bike saddle characterized in that the left and right sliding and the front and rear sliding motions are controlled due to the adjusted turning radius.
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