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An exercise device comprising two box-like open-sided platform sections disposed side-by-side in a closed, storage and transporting position or end-to-end in an open exercising position and having two rotary disk assemblies that are mountable in a plurality of fixed exercising positions along the pl

An exercise device comprising two box-like open-sided platform sections disposed side-by-side in a closed, storage and transporting position or end-to-end in an open exercising position and having two rotary disk assemblies that are mountable in a plurality of fixed exercising positions along the platform sections by means of pins on the lower sides of the disk assemblies and a longitudinal series of mounting holes in each platform section. Elongated elastic resistance bands are connectable between the rotary disks, on hook connectors thereon, and between the disks and the platform sections, in various ways for closed-chain operation, when desired, or removable for open-chain exercises. A carrying handle and latches are provided in the platform sections, and U-shaped connectors are provided to join the platform sections together.

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1. An exercise device having, in combination:an elongated, two-piece base platform adapted to be placed on a flat supporting surface and comprising two elongated, generally rectangular and substantially similar box-like platform sections each having a closed upper side and narrow sidewalls and end w

1. An exercise device having, in combination:an elongated, two-piece base platform adapted to be placed on a flat supporting surface and comprising two elongated, generally rectangular and substantially similar box-like platform sections each having a closed upper side and narrow sidewalls and end walls having edges for engaging the supporting surface, said sidewalls and end walls defining an open lower side of each platform section; said platform sections being positionable in end-to-end relation to form an elongated base platform and being positionable with said edges together in a closed position for transporting and storing the exercise device; releasable base connectors for joining said platform sections together in end-to-end relation comprising U-shaped connecting pins, said base sections having two sets of holes for receiving ends of the base connectors with the latter straddling the adjacent end walls of the base sections; two rotary disk assemblies each having an upper disk element sized to support a user's foot, or hand, a lower disk element mountable on one of the platform sections, and a bearing between said elements rotatably supporting the upper disk element on the lower disk element; each of said platform sections having a longitudinal series of spaced mounting holes in the central portion of the upper side thereof and each of said lower disk elements having a lower side and a depending mounting pin on the lower side engageable in a selected one of said mounting holes to position the disk assembly on the platform section; and selectively engageable and releasable latches on said platform sections for holding them releasably in the closed position, and a carrying handle on one of said sidewalls, said disk assemblies being sized to fit within the exercise device in said closed position with said mounting pins reversely engaged in selected mounting holds in said upper sides. 2. An exercise device having, in combination:an elongated, two-piece base platform adapted to be placed on a flat supporting surface and comprising two elongated, generally rectangular and substantially similar box-like platform sections each having a closed upper side and narrow sidewalls and end walls having edges for engaging the supporting surface, said sidewalls and end walls defining an open lower side of each platform section; said platform sections being positionable in end-to-end relation to form an elongated base platform and being positionable with said edges together in a closed position for transporting and storing the exercise device; two rotary disk assemblies each having an upper disk element sized to support a user's foot, or hand, a lower disk element mountable on one of the platform sections, and a bearing between said elements rotatably supporting the upper disk element on the lower disk element; each of said platform sections having a longitudinal series of spaced mounting holes in the central portion of the upper side thereof and each of said lower disk elements having a lower side and a depending mounting pin on the lower side engageable in a selected one of said mounting holes to position the disk assembly on the platform section; a balance bar mountable in a transverse position on one of said platform sections to extend between the sidewalls thereof, said balance bar having a lower side disposed beneath the side edges of said one of the platform sections to form a balancing fulcrum for the platform section and having a length less than the transverse spacing of said sidewalls and said sidewalls are formed with sockets on their inner sides for receiving the ends of the balance bar, and wherein each of the sockets is formed by the adjacent sides of a pair of spaced blocks fastened to the inner sides of the sidewalls. 3. An exercise device having, in combination:an elongated platform adapted to be placed on a supporting surface and having an upper side; two rotary disk assemblies each having an upper rotary disk element sized to support a user's body a longitudinal series of spaced first mounting elements on said upper side and spaced apart thereon at preselected intervals; a second mounting element on each of said disk assemblies that is engageable with a selected one of first mounting elements and operable, when engaged, to hold the associated disk assembly rotatably in a selected discrete exercise position on said platform; wherein each of said rotary disk elements has first connectors on diametrically opposite sides, and said platform has second connectors adjacent its opposite longitudinal ends; and further including second elastic resistance elements extending between and releasably secured to said first and second connectors; said disk assemblies being movable to different positions on said platform to vary the spacing of the rotary disk elements during exercise. 4. An exercise device as defined in claim 3 wherein said second connectors include pinholes adjacent the ends of said platform and pins attached to said second resistance elements and sized to be received releasably in said pinholes.5. An exercise device having, in combination:an elongated platform adapted to be placed on a supporting surface and having an upper side; two rotary disk assemblies each having an upper rotary disk element sized to support a user's body; a longitudinal two mounting elements on said upper side spaced apart by a preselected interval; a second mounting element on each of said disk assemblies that is engageable with one of said first mounting elements and operable, when engaged, to hold the associated disk assembly rotatably in a discrete exercise position on said platform; said disk assemblies being rotatable on said platform while weight of a user is supported by the disk assemblies; wherein each of said rotary disk elements has first connectors on diametrically opposite sides, and said platform has second connectors adjacent its opposite longitudinal ends, and further including second elastic resistance elements extending between and releasably secured to said first and second connectors. 6. An exercise device as defined in claim 5 wherein said second connectors include pinholes adjacent the ends of said platform and pins attached to said second resistance elements and sized to be received releasably in said pinholes.