We claim the ornamental design for an exercise platform, as shown and described.
FIG. 1 is an isometric view of the bottom of an exercise platform showing our new design in an open position, the unclaimed legs being shown deployed.
FIG. 2 is a top plan view of the exercise platform in the open position.
FIG. 3 is a bottom plan view of the exercise platform in the open position, the unclaimed legs being shown un-deployed.
FIG. 4 is a front view of the exercise platform in the open position with unclaimed legs deployed.
FIG. 5 is a back plan view of the exercise platform in the open position with unclaimed legs un-deployed.
FIG. 6 is a first end view of the exercise platform in the open position with unclaimed legs deployed;
FIG. 7 is a second end view of the exercise platform in the open position with unclaimed legs un-deployed; and,
FIG. 8 is an isometric view of the exercise platform in a closed position.
The broken line depictions of the legs, resistance bands, internal framework, and other structure are included for environmental purposes and form no part of the claimed design.