The present invention is related to structures useful for amusement parks, and more particularly to a novel fixed structure which is lifted at different levels with respect to the floor, by only using the user's effort. The advantages of the present invention over prior state-of-the-art structures are that the inventive structure is useful for working-out muscular strength and coordination between different muscular groups; it uses the stretch stress of elastic materials for upwardly and downwardly moving; it is easily displaced from a first position to a second position. The structure is characterised in that it comprises a plurality of beds arranged at different levels of the structure, said beds comprising a rigid frame and a plurality of elastic belts attached by the end portions thereof to two points of said beds; the belts are arranged at variable predetermined intervals with respect to each other so that the user may be supported upon the lower bed belts, while ascending to the upper beds, and slid through the spaces of the upper bed.
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