Multi-functional exercise apparatus

1. A multi-functional exercise apparatus for performing both isolated lower body, core, and upper body resistance training exercises and full-body strength training exercises to improve a fitness of a user, the exercise apparatus comprising:

an elongate body having a length along a longitudinal axis between end walls, a width along a transverse axis between sidewalls, and a thickness between a first surface and a second surface, with the first and second surfaces being substantially planar across a center portion of the elongate body;

a central aperture defined through the thickness of the elongate body, the central aperture having an aperture length between aperture ends configured to accommodate a shoulder width of the user, and an aperture width between aperture sides configured to accommodate a chest-to-back thickness of the user;

a handle proximate to each aperture end configured for gripping by hands of the user; and

at least one empty volume formed between each aperture end and an adjacent end wall of the elongate body and configured to removably receive an additional mass for increasing a weight of the elongate body,

wherein the elongate body is formed from a resilient and impact resistant material and includes an inner frame made from a rigid material positioned therein for structural support, and

wherein the thickness of the elongate body is greater than or about three inches.

2. The exercise apparatus of claim 1 , wherein the resilient and impact resistant material is selected from the group consisting of a hard rubber composite, a fiberglass composite, a Kevlar composite, a plastic composite, and wood.

3. The exercise apparatus of claim 1 , wherein the rigid material is selected from the group consisting of metal, steel, aluminum, carbon fiber, and structural plastic.

4. The exercise apparatus of claim 1 , wherein the elongate body is separable along the transverse axis into two halves that slidably expand outward along the inner frame.

5. The exercise apparatus of claim 1 , wherein the handles proximate to each respective aperture end further comprise bars extending between the aperture sides and spaced from the aperture ends.

6. The exercise apparatus of claim 1 , wherein the handles proximate to each respective aperture end further comprise exposed portions of the inner frame comprising tubular bars.

7. The exercise apparatus of claim 1 , wherein the elongate body is operable for lowering from an overhead press position above a head of the user down around shoulders of the user with the longitudinal axis of the elongate body configured to be aligned with a spine of the user when the spine of the user is in an upright and neutral position.

8. The exercise apparatus of claim 1 , wherein the at least one empty volume further comprises at least one side chamber extending parallel to the transverse axis of the elongate body and opening from one of the sidewalls of the elongate body, and configured for receiving the additional mass for increasing the weight of the elongate body, wherein the additional mass is a weighted insert of known mass.

9. The exercise apparatus of claim 8 , wherein the weighted insert further comprises a rod of known weight that is securable within the at least one side chamber.

10. The exercise apparatus of claim 9 , wherein the rod of known weight has a tubular construction.

11. The exercise apparatus of claim 8 , wherein the weighted insert further comprises a sealable cylinder filled with a liquid to define a known weight and that is securable within the at least one side chamber.

12. The exercise apparatus of claim 1 , wherein the at least one empty volume further comprises a sealable chamber adapted for filling with a liquid to define a known weight.

13. The exercise apparatus of claim 1 , wherein the at least one empty volume is only partially filled with a fluid medium to create a dynamic shifting of the additional mass during exercise.

14. The exercise apparatus of claim 1 , further comprising a platform removably supported on the handles to cover the central aperture.

15. The exercise apparatus of claim 14 , wherein a top surface of the platform is substantially flush with the first surface of the elongate body.

16. The exercise apparatus of claim 14 , further comprising:

a pair of riser supports removably securable to the elongate body respectively proximate to the aperture sides to extend upward out-of-plane from the first surface; and

a stretchable resistance band securable to the pair of riser supports to extend transversely across the platform covering the central aperture.

17. The exercise apparatus of claim 1 , further comprising at least one attachment point proximate to the end walls of the elongate body and configured for securing a cord for pulling the elongate body along its longitudinal axis over a ground surface.

18. A multi-functional exercise apparatus for performing both isolated lower body, core, and upper body resistance training exercises and full-body strength training exercises to improve a fitness of a user, the exercise apparatus comprising:

an elongate body having a length along a longitudinal axis between end walls, a width along a transverse axis between sidewalls, and a thickness between a first surface and a second surface, with the first and second surfaces being substantially planar across a center portion of the elongate body;

a central aperture defined through the thickness of the elongate body, the central aperture having an aperture length between aperture ends configured to accommodate a shoulder width of the user, and an aperture width between aperture sides configured to accommodate a chest-to-back thickness of the user;

a handle proximate to each aperture end configured for gripping by hands of the user; and

at least one empty volume formed between each aperture end and an adjacent end wall of the elongate body and configured to removably receive an additional mass for increasing a weight of the elongate body,

wherein the elongate body is formed from a resilient and impact resistant material and includes an inner frame made from a rigid material positioned therein for structural support, and

wherein the first and second surfaces include curved end portions that curve inwardly to substantially flat end wall surfaces, the substantially flat end wall surfaces having a height less than about two-thirds the thickness of the elongate body.

19. The exercise apparatus of claim 18 , wherein the substantially planar portions of the first and second surfaces are smooth to facilitate sliding across a ground surface and the curved end portions of the first and second surfaces are textured to provide a gripping surface.

20. A multi-functional exercise apparatus for performing both isolated lower body, core, and upper body resistance training exercises and full-body strength training exercises to improve a fitness of a user, the exercise apparatus comprising:

an elongate body having a length along a longitudinal axis between end walls, a width along a transverse axis between sidewalls, and a thickness between a first surface and a second surface, with the first and second surfaces being substantially planar across a center portion of the elongate body;

a central aperture defined through the thickness of the elongate body, the central aperture having an aperture length between aperture ends configured to accommodate a shoulder width of the user, and an aperture width between aperture sides configured to accommodate a chest-to-back thickness of the user;

a handle proximate to each aperture end configured for gripping by hands of the user; and

at least one empty volume formed between each aperture end and an adjacent end wall of the elongate body and configured to removably receive an additional mass for increasing a weight of the elongate body,

wherein the elongate body is formed from a resilient and impact resistant material and includes an inner frame made from a rigid material positioned therein for structural support, and

wherein the sidewalls curve inwardly toward the end walls of the elongate body to substantially flat end wall surfaces, the substantially flat end wall surfaces having a width less than about two-thirds the width of the elongate body.