Variable resistance system

1. A variable resistance system comprising:

a resistance providing member;

an actuator comprising a motor and an actuator magnet having a first pole and a second pole; and

a selector assembly;

wherein the motor rotates the actuator magnet and the actuator causes the selector assembly to selectively engage or disengage the resistance providing member by applying or removing a force to or from the selector assembly; and

wherein movement of the selector assembly is dissociated from the position of the actuator.

2. The variable resistance system of claim I wherein the force is selected from the group consisting of a magnetic force and a gravitational force.

3. The variable resistance system of claim I wherein the resistance providing member is comprised of a plurality of vertically oriented weight plates arranged in a side-by-side manner relative to each other.

4. The variable resistance system of claim 1 , wherein the actuator further comprises a first sensor that senses the rotational position of the actuator magnet.

5. The variable resistance system of claim 1 wherein the resistance providing member comprises a resistance hook and the selector assembly comprises a selector hook and a selector magnet, the selector magnet having a first pole and a second pole.

6. The variable resistance system of claim 5 wherein:

the first pole of the selector magnet is attracted to the second pole of the actuator magnet; and

the selector hook is actuated to selectively disengage from the resistance hook by the rotation of the actuator magnet to a first position characterized by the second pole of the actuator magnet substantially facing the first pole of the selector magnet.

7. The variable resistance system of claim 6 wherein the selector hook is actuated to selectively engage the resistance hook by the rotation of the actuator magnet to a second position characterized by the second pole of the actuator magnet not substantially facing the first pole of the selector magnet.

8. The variable resistance system of claim 7 wherein a force of gravity causes the selector hook to move into the second position.

9. The variable resistance system of claim 5 wherein the selector hook has an inner surface at an inner angle, the resistance hook has an inner surface at an inner angle, and interaction between the inner surface of the selector hook and the inner surface of the resistance hook causes the selector hook to rotate towards the resistance hook.

10. The variable resistance system of claim 9 wherein the inner angle of the selector hook is approximately seventy-two degrees and the inner angle of the weight hook is approximately sixty degrees.

11. The variable resistance system of claim 4 further comprising a second sensor that detects the position of the selector assembly.

12. The variable resistance system of claim 11 further comprising a controller that receives signals from the first sensor and the second sensor and controls the actuator.

13. The variable resistance system of claim 12 further comprising a user interface console that accepts input from a user and provides command instructions to the controller.

14. The variable resistance system of claim 13 wherein the user interface console comprises programmed logic that determines whether to engage/disengage the resistance providing member on the basis of information collected by the second sensor.

15. The variable resistance system of claim 13 further comprising a removable memory card that stores exercise related information.

16. An exercise device comprising:

an exercise machine; and

a variable resistance system operatively connected to the exercise machine, wherein the variable resistance system comprises:

a resistance providing member comprising a resistance hook;

an actuator comprising:

a motor; and

an actuator magnet having a first pole and a second pole;

wherein the motor rotates the actuator magnet;

a selector assembly comprising:

a selector magnet having a first pole and a second pole; and

a selector hook;

a first sensor that senses the rotational position of the magnet; and

a second sensor that senses the position of the resistance providing member;

wherein the actuator actuates the selector assembly to selectively engage or disengage the resistance providing member by applying or removing a force to or from the selector assembly; and

wherein movement of the selector assembly is dissociated from the position of actuator.

17. The exercise device of claim 16 wherein:

the first pole of the selector magnet is attracted to the second pole of the actuator magnet;

the selector hook is actuated to selectively disengage from the resistance hook by rotation of the actuator magnet to a first position characterized by the second pole of the actuator magnet substantially facing the first pole of the selector magnet; and

the selector hook is actuated to selectively engage the resistance hook by the rotation of the actuator magnet to a second position characterized by the second pole of the actuator magnet not substantially facing the first pole of the selector magnet.

18. The exercise device of claim 17 , wherein the variable resistance system further comprises:

a controller that receives signals from the first sensor and the second sensor and controls the actuator;

a user interface console that accepts input from a user and provides command instructions to the controller, wherein the user interface console comprises programmed logic that determines whether to engage or disengage the resistance providing member on the basis of information collected by the second sensor.

19. An exercise machine comprising:

a resistance providing member having a rest position and a lift position;

a selector assembly connected to and moving with the resistance providing member between the rest position and the lift position, the selector assembly comprising a selector magnet having an engaged position and a disengaged position, wherein the engaged position corresponds with the selector assembly being engaged with the resistance providing member and the disengaged position corresponds with the selector assembly being disengaged from the resistance providing member; and

an actuator assembly fixed relative to the rest position, the actuator assembly comprising a controller and an actuator magnet, wherein the controller causes the actuator magnet to apply a magnetic force to the selector magnet and move the selector magnet between the engaged position and the disengaged position.

20. The exercise device of claim 19 wherein the resistance providing member is comprised of a plurality of vertically oriented weight plates arranged in a side-by-side manner relative to each other and each of the plates has a weight hook, wherein the selector assembly is further comprised of a selector hook connected to the selector magnet, and wherein the actuator assembly is further comprised of a motor connected to the actuator magnet.

21. The exercise device of claim 19 wherein the resistance providing member is comprised of a plurality of weights moving between the rest position and the lift position, the selector assembly is further comprised of a plurality of selector magnets, and the actuator assembly is further comprised of a plurality of actuator magnets, wherein each of the actuator magnets corresponds with one of the selector magnets and one of the weights, and wherein a first combination of the weights are engaged according to the positions of the corresponding selector magnets as moved by the actuator magnets while the weights and selector magnets are in the rest position, the first combination of weights moving from the rest position to the lift position with the corresponding selector magnets while the actuator magnets remain at the rest position.

22. The exercise device of claim 21 wherein the actuator magnets attract the corresponding selector magnets to disengage their respective weights while the selector magnets and the weights are in the rest position.

23. An exercise machine comprising:

a resistance providing member comprising a plurality of weights moving from a rest position to a lift position;

a selector assembly attached to the resistance providing member, the selector assembly comprising a plurality of selector magnets corresponding with the plurality of weights, wherein each of the selector magnets can move from an engaged position to a disengaged position, the engaged position corresponding with the selector assembly being engaged with the weights and the disengaged position corresponding with the selector assembly being disengaged from the weights, wherein the selector assembly moves with the weights from the rest position to the lift position; and

an actuator assembly fixed relative to the rest position, the actuator assembly comprising a controller and a plurality of actuator magnets, wherein the controller causes the actuator magnets to apply a magnetic force to the respective selector magnets to move the selector magnets between the engaged position and the disengaged position while the selector magnets are in the rest position.

24. An exercise machine comprising:

a plurality of resistance providing members, wherein at least one of the resistance providing members moves from a rest position to a lift position;

a selector assembly connected to and moving with at least one of the resistance providing members between the rest position and the lift position, and when in the rest position, the selector assembly comprising an engaged position and disengaged position, wherein the first position corresponds with the selector assembly being engaged with at least one of the resistance providing members and the second position corresponds with the selector assembly being disengaged from other resistance providing members; and

an actuator assembly located at a fixed position proximate to the selector assembly at the rest position, wherein the actuator assembly applies a force to the selector assembly while the selector assembly is at the rest position and moves the selector assembly between the engaged position and the disengaged position, wherein the movement of the selector assembly between the rest position and the lift position is dissociated from the fixed position of the actuator assembly, the dissociated movement being without a connection between the actuator assembly with the selector assembly.

25. The exercise device of claim 24 wherein the resistance providing members are comprised of a plurality of vertically oriented weight plates arranged in a side-by-side manner relative to each other and each of the plates has a weight hook, wherein the selector assembly is comprised of a plurality of selector hooks connected to selector magnets, and wherein the actuator assembly is comprised of at least one controller and a plurality of actuator magnets, wherein the controller causes the actuator magnets to apply a magnetic force to the respective selector magnets to move the selector magnets between the engaged position and the disengaged position while the selector magnets are in the rest position, and wherein the selector hooks engage the weight hooks in the engaged position.