The present invention relates to a modified saddle which comprises a buttock support and an impact alleviating device using pneumatic pressure. The buttock support is vertically stood at an angle of 82 degrees to be connected to a part which is 24 cm rearwardly apart from the narrowest part on an upper side of a saddle seat, wherein the buttock support has a height of 9 cm. Thus, a horse rider, who is being pushed backward by an advancing rhythm of a horse, can advance by being bounded from the buttock support. A sealed rubber tube equipped with an air injection valve is inserted into a device for alleviating an impact generated by a weight of the horse rider and a backbone of a horse under the saddle.
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