Body vibration apparatus

1. A body vibration apparatus comprising:

an at least partially rigid platform;

a first motor coupled to the platform such that movement of the first motor imparts force to the platform, the first motor having a first shaft that selectively rotates in one of a first direction and a second direction;

a first eccentric weight coupled to the first shaft such that the first eccentric weight rotates with the first shaft at a first phase and in a first plane;

a second motor coupled to the platform such that movement of the second motor imparts force to the platform, the second motor having a second shaft parallel to the first shaft that selectively rotates in the other of the first direction and the second direction;

a second eccentric weight coupled to the second shaft in the first plane such that the second eccentric weight rotates with the second shaft at the first phase;

a third eccentric weight proximate the first eccentric weight, the third eccentric weight coupled for rotation about the first shaft only between a first angular orientation with respect to the first eccentric weight and a second angular orientation with respect to the first eccentric weight, the second angular orientation with respect to the first eccentric weight being different from the first angular orientation with respect to the first eccentric weight; and

a forth eccentric weight proximate the second eccentric weight, the forth eccentric weight coupled for rotation about the second shaft only between a first angular orientation with respect to the second eccentric weight and a second angular orientation with respect to the second eccentric weight, the second angular orientation with respect to the second eccentric weight being different from the first angular orientation with respect to the second eccentric weight.

2. The apparatus of claim 1 , further comprising:

a motor drive providing power to the first motor and second motor; and

a controller controlling the power provided by the motor drive to the first motor and the second motor.

3. The apparatus of claim 2 , further comprising a first interface coupled to the controller for selecting a desired characteristic of motor operation.

4. The apparatus of claim 3 , where in the desired characteristic of motor operation is a frequency of motor rotation.

5. The apparatus of claim 3 , wherein the desired characteristic of motor rotation is an on or off power status of the first motor and the second motor.

6. The apparatus of claim 3 , wherein the desired characteristic of motor rotation is a duration over which power is supplied to the first motor and the second motor.

7. The apparatus of claim 3 , wherein the desired characteristic of motor rotation is a direction of rotation of the first motor, the second motor, or both.

8. The apparatus of claim 3 , further comprising a second interface coupled to the controller for selecting the desired power setting.

9. The apparatus of claim 8 , wherein the second interface is located closer to the platform than is the first interface.

10. The apparatus of claim 1 , further comprising a console coupled to the platform and projecting upward therefrom.

11. The apparatus of claim 10 , further comprising a handlebar connected to the console.

12. The apparatus of claim 1 , further comprising:

a first motor mounting frame coupled to and at least partially supporting the first motor, the second motor, and the platform; and

at least one vibration mount coupled to and at least partially supporting the first motor mounting frame.

13. The apparatus of claim 12 , wherein the at least one vibration mount is at least partially resilient.

14. The apparatus of claim 13 , wherein the at least one vibration mount damps movement of the motor mounting frame more in a direction transverse to the first shaft than in a vertical direction.

15. The apparatus of claim 12 , wherein the at least one vibration mount is hollow.

16. The apparatus of claim 12 , wherein the at least one vibration mount has a substantially hexagonal cross-section.

17. The apparatus of claim 12 , further comprising a metal baseplate supporting the at least one vibration mount.

18. The apparatus of claim 1 , wherein the first eccentric weight includes a first rigid projection on a first side projecting toward the third eccentric weight,

wherein the second eccentric weight includes a second rigid projection on a second side opposite the first side projecting toward the fourth eccentric weight, and

wherein the first rigid projection and the second rigid projection are located such that when the first eccentric weight and the second eccentric weight are rotated in the respective first and second directions, respective edges of the first eccentric weight and the second eccentric weight engage the first and second rigid projections of the respective third eccentric weight and fourth eccentric weight to rotate them.

19. The apparatus of claim 1 , wherein when the first eccentric weight is rotated in the first direction, the first eccentric weight rotates in a first relationship with respect to the third eccentric weight, and wherein when the first eccentric weight is rotated in the second direction, the first eccentric weight rotates in a second relationship with respect to the third eccentric weight.

20. The apparatus of claim 19 , wherein when the second eccentric weight is rotated in the second direction, the second eccentric weight rotates in a first relationship with respect to the fourth eccentric weight, and wherein when the second eccentric weight is rotated in the first direction, the second eccentric weight rotates in a second relationship with respect to the fourth eccentric weight.

21. The apparatus of claim 1 , wherein the first direction is opposite to the second direction.