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Embodiments are described for an exercise sled including an upper portion detachably coupled to a lower portion through telescoping leg assemblies located at the corners of the sled. The upper portion includes a flat jumping surface to facilitate jumping or step-up type exercises, and the lower port

Embodiments are described for an exercise sled including an upper portion detachably coupled to a lower portion through telescoping leg assemblies located at the corners of the sled. The upper portion includes a flat jumping surface to facilitate jumping or step-up type exercises, and the lower portion includes a sled rail portion to facilitate sliding across a surface, and a weight platform for the addition of plate weights. A number of attachment hooks facilitate the use of cords or handles to perform resistance exercises using the sled as an exercise platform.

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1. An exercise sled comprising: a lower portion of substantially rectangular shape defined along a plane and having four legs positioned perpendicular to the plane at each corner of the rectangle, wherein the lower portion comprises a pair of rails for sliding across a ground each rail having a firs

1. An exercise sled comprising: a lower portion of substantially rectangular shape defined along a plane and having four legs positioned perpendicular to the plane at each corner of the rectangle, wherein the lower portion comprises a pair of rails for sliding across a ground each rail having a first portion with a surface engageable with the ground along the plane and an upwardly projecting portion rising up from the surface;an upper portion detachably coupled to the lower portion through matching leg sections and including a flat surface, wherein the upper portion and lower portion each comprises a plurality of legs disposed perpendicular to the top surface, and wherein the legs of the upper portion are configured to be inserted within corresponding legs of the lower portion, and wherein the plurality of legs of the upper portion and lower portion each include at least one hole drilled therethrough to accommodate a fixing pin that fixes an inserted location of a leg of the upper portion to the corresponding leg of the lower portion; anda plurality of attachment hooks disposed around at least one of the lower portion and upper portion for facilitating pulling or pushing the sled across the surface. 2. The exercise sled of claim 1 wherein the lower portion includes a weight platform including a post structure to hold a weight plate. 3. The exercise sled of claim 2 wherein the weight platform comprises a flat section coupled between the pair of rails. 4. The exercise sled of claim 1 wherein the upwardly projecting portion comprises a curved portion, and the lower portion and upper portion include a frame structure. 5. The exercise sled of claim 4 wherein the frame structure comprises a metal tube structure. 6. The exercise sled of claim 5 wherein the tube structure includes a portion of square cross-section tubing. 7. The exercise sled of claim 1 further comprising a non-slip layer placed on top of the flat surface of the upper portion and configured to accommodate aerobic-style exercises. 8. The exercise sled of claim 7 wherein the non-slip layer is made of a material selected from the group consisting of: rubber, synthetic rubber, fabric, and mat. 9. The exercise sled of claim 7 wherein the aerobic-style exercises include running in place, step ups, sit ups, lunges, and squats. 10. The exercise sled of claim 1 wherein the plurality of attachment hooks are configured to attach to a plurality of cords. 11. The exercise sled of claim 10 further comprising a selection of accessories attachable to the cords to facilitate pushing or pulling the sled. 12. An apparatus for performing exercises by one or more people simultaneously by dragging the apparatus along a surface or using the apparatus as weight resistance, comprising: a jumping box including an upper portion detachably coupled to a lower portion and a non-slip layer on a top surface of the box;a sled portion formed as part of the jumping box and comprising upward projected rails configured to slide along the surface; anda plurality of fixed hooks disposed around the upper portion and lower portion to facilitate the attachment of pushing or pulling accessories, wherein the upper portion and lower portion each comprises a plurality of legs disposed perpendicular to the top surface, and wherein the legs of the upper portion are configured to be inserted within corresponding legs of the lower portion, and wherein the plurality of legs of the upper portion and lower portion each include at least one hole drilled therethrough to accommodate a fixing pin that fixes an inserted location of a leg of the upper portion to the corresponding leg of the lower portion. 13. The apparatus of claim 12 further comprising a weight platform coupled to the lower portion and configured to mount one or more weight plates to the apparatus. 14. The apparatus of claim 12 wherein the upper portion and lower portion are formed in a substantially square shape, and wherein the plurality of legs of the upper portion and lower portion each comprise four legs placed at the corners of the substantially square shape. 15. A modular exercise apparatus comprising: a bottom sled portion comprising a pair of upward projecting rails having a flat section for sliding along a surface, wherein rails of the pair of rails are coupled to each other through a beam section;an upper jumping box portion detachably coupled to the bottom sled portion through a telescoping leg assembly that allows the upper jumping box portion to be set at one of a plurality of defined heights relative to the surface; anda non-slip layer coupled the upper jumping box portion to facilitate movement of one or more users on the upper jumping box, wherein the telescoping leg assembly comprises a first set of legs coupled to the upper jumping box and disposed perpendicular to a plane defined by the surface; and a second set of legs coupled to the bottom sled portion and disposed perpendicular to the plane defined by the surface, and wherein the first set of legs is configured to be insertable into the second set of legs and attached in a fixed manner by pins inserted through holes formed in each of the first and second set of legs. 16. The apparatus of claim 15 further comprising a plurality of hooks disposed at fixed locations around the bottom sled portion and upper jumping box portion for attachment of pulling accessories, and further comprising a weight platform attached to the beam section for secure placement of weight plates to the apparatus.