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An exercise footboard structure includes a base, a lower support seat, an upper support seat, and a plank. The lower support seat is adjustably mounted on a cylindrical pillar of the base. The upper support seat is mounted on the lower support seat in conjunction with a plurality of elastic pieces w

An exercise footboard structure includes a base, a lower support seat, an upper support seat, and a plank. The lower support seat is adjustably mounted on a cylindrical pillar of the base. The upper support seat is mounted on the lower support seat in conjunction with a plurality of elastic pieces which are fastened between the lower support seat and the upper support seat. The plank is mounted on the upper support seat such that the plank can be caused by an external force to tilt or swivel back and forth.

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1. An exercise footboard structure comprising: a base comprised of, in an upper side, a threaded cylindrical pillar mounted uprightly thereon; a lower support seat comprised of an inner threaded hole and mounted adjustably on said threaded cylindrical pillar such that said inner threaded hole of

1. An exercise footboard structure comprising: a base comprised of, in an upper side, a threaded cylindrical pillar mounted uprightly thereon; a lower support seat comprised of an inner threaded hole and mounted adjustably on said threaded cylindrical pillar such that said inner threaded hole of said lower support seat is adjustably engaged with said threaded cylindrical pillar; an upper support seat mounted on said lower support seat in conjunction with a plurality of elastic elements whereby said elastic elements are fastened between said upper support seat and said lower support seat; and a plank mounted on said upper support seat such that said plank can be caused by an external force to tilt or swivel horizontally. 2. The exercise footboard structure as defined in claim 1, wherein said elastic elements take the form of an arch and are fastened to said lower support seat; wherein said upper support seat is comprised of a plurality of retaining portions and is mounted on said lower support seat such that said arch-shaped elastic elements of said lower support seat are retained by said retaining portions of said upper support seat. 3. The exercise footboard structure as defined in claim 2 wherein said retaining portions of said upper support seat are hooks. 4. The exercise footboard structure as defined in claim 2, wherein said retaining portions of said upper support seat are retaining grooves. 5. The exercise footboard structure as defined in claim 1, wherein said elastic elements take the form of a bar and are fastened at one end thereof to said lower support seat; wherein said upper support seat is comprised of a plurality of retaining portions and is mounted on said lower support seat such that another end of said bar-shaped elastic elements is retained by one of said retaining portions of said upper support seat. 6. The exercise footboard structure as defined in claim 5, wherein said retaining portions of said upper support seat are retaining holes. 7. The exercise footboard structure as defined in claim 1, wherein said threaded cylindrical pillar is comprised of a retaining slot extending in a longitudinal direction of said threaded cylindrical pillar; wherein said lower support seat is comprised of, in a wall thereof, a through hole extending through the wall to communicate with said inner threaded hole of said lower support seat such that said through hole is perpendicular to said retaining slot of said threaded cylindrical pillar, said lower support seat being adjustably mounted on said threaded cylindrical pillar such that said lower support seat is located on a specific level of said threaded cylindrical pillar by a locating pin whereby said locating pin is movably disposed in said through hole of the wall of said lower support seat such that an inner end of said locating pin is removably retained in said retaining slot of said threaded cylindrical pillar. 8. The exercise footboard structure as defined in claim 7, wherein said locating pin is comprised of a spring fitted thereover.