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An exercise device includes a relatively rigid platform supported by a compressible base. The base has a central flat and then slopes outward and upward from the central flat in a spherical section. The base permits instability in height, angle, and shear strain movement. The user performs postures

An exercise device includes a relatively rigid platform supported by a compressible base. The base has a central flat and then slopes outward and upward from the central flat in a spherical section. The base permits instability in height, angle, and shear strain movement. The user performs postures and/or exercises using the exercise device under each appendage being used for support. The instability triggers the Golgi tendon receptor and the muscle spindle receptor and thereby achieves physiological benefits. The muscular training devices come in different sizes and configurations to make up a muscular training system.

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1. An exercise device sized for a single appendage of human support, comprising: a compressible base, the base having a horizontally-extending central flat for maintaining a balanced, upright position of the exercise device before being loaded, the base having at least one side encircling the centra

1. An exercise device sized for a single appendage of human support, comprising: a compressible base, the base having a horizontally-extending central flat for maintaining a balanced, upright position of the exercise device before being loaded, the base having at least one side encircling the central flat which slope outward and upward around the central flat with a slope which increases as distance from the central flat increases, the sides permitting simultaneous pitch and roll instability to the exercise device at a beginning slope immediately adjacent the central flat of less than 45°; anda relatively rigid platform joined to and horizontally covering the compressible base at a height no greater than 10 inches over a bottom surface of the flat, the platform having a shape which provides substantially equal pitch and roll instability, the platform having an exposed, flat top providing a flat surface sized for a single appendage of human support and at least 3 inches wider than the central flat, wherein the platform comprises an interchangeable grip surface on a plate, the grip surface having a different material, different amount of compressibility or different surface finish than the plate. 2. The exercise device of claim 1, wherein the central flat of the compressible base is circular and has a diameter within the range of 1 to 4 inches before being loaded, and wherein the platform is circular with a diameter from 4 to 16 inches. 3. The exercise device of claim 2, wherein the sides of the compressible base are spherical. 4. The exercise device of claim 1, wherein the compressible base is formed by an air-filled bladder in a flexible rubberized material. 5. The exercise device of claim 4, wherein air bladder is filled with air pressure within the range of 2 to 20 psi. 6. The exercise device of claim 1, wherein the platform comprises a top rotatable relative to the base about a central perpendicular axis of the platform. 7. The exercise device of claim 6, wherein the top provides a rotation resistance within the range of 0.2 to 5 ft-lbs. 8. The exercise device of claim 6, wherein the top provides a rotation resistance which increases as a function of angular displacement from a balanced center point. 9. The exercise device of claim 1, wherein the platform is circular with a diameter within the range of 4 to 16 inches. 10. The exercise device of claim 1 provided as a part of a progression of such exercise devices, with each exercise device in the progression having a different size of central flat before being loaded. 11. The exercise device of claim 1 provided as a part of a progression of such exercise devices, with each exercise device in the progression having a different beginning slope immediately adjacent the central flat before being loaded. 12. The exercise device of claim 1 provided as a part of a progression of such exercise devices, with each exercise device in the progression having a different height of the platform over the flat before being loaded. 13. A method of exercising comprising: placing a single appendage of human support on an exercise device, the exercise device comprising: a compressible base, the base having a horizontally-extending central flat for maintaining a balanced, upright position of the exercise device before being loaded, the base having at least one side encircling the central flat which collectively slope outward and upward around the central flat with a slope which increases as distance from the central flat increases, the at least one side permitting simultaneous pitch and roll instability to the exercise device at a beginning slope immediately adjacent the central flat of less than 45°; anda relatively rigid platform joined to and horizontally covering the compressible base at a height no greater than 8 inches over a bottom surface of the flat, the platform having an exposed, flat top providing a flat surface sized for a single appendage of human support, wherein the platform comprises an interchangeable grip surface on a plate, the grip surface having a different material, different amount of compressibility or different surface finish than the plate;performing a large body exercise while maintaining balance on the exercise device;interchanging the grip surface with a second interchangeable grip surface; and thereafterperforming a second large body exercise while maintaining balance on the exercise device. 14. The method of claim 13, wherein at least two such exercise devices are used during the large body exercise, each for a different appendage of human support. 15. The method of claim 13, wherein the large body exercise is performed using a posture selected from the group consisting of: standing posture;athletic posture;bow posture;sprinter posture;plank posture (downward facing);bridge posture (upward facing);back bend posture (backward inversion); andside plank posture. 16. The method of claim 13, wherein the large body exercise involves movement of one or more joints selected from the group consisting of: neck;back;shoulder;elbow;wrist;fingers;hip;knee;ankle; andtoe. 17. An exercise device sized for a single appendage of human support, comprising: a compressible base which, when positioned on a horizontal floor maintains a balanced, upright position of the exercise device, the base when compressed by body weight permitting simultaneous pitch and roll instability to the exercise device by having a majority of its surface generally in the shape of a spherical section; anda relatively rigid platform joined to and horizontally covering the compressible base at a height no greater than 10 inches over a bottom surface of the base, the platform having a shape which provides substantially equal pitch and roll instability, the platform having an exposed, flat top providing a flat surface sized for a single appendage of human support, wherein the top is rotatable relative to the base about a central perpendicular axis of the platform; wherein the exposed, flat top is circular with a diameter within the range of 4 to 16 inches and the platform comprises an interchangeable grip surface on a plate, the grip surface having a different material, different amount of compressibility or different surface finish than the plate. 18. The exercise device of claim 17 provided as a part of a progression of such exercise devices, with each exercise device in the progression having a different height of the platform over the bottom surface of the base before being loaded.