Support frame and related unweighting system

1. An unweighting exercise system, comprising:

a frame configured to be attached to or placed at least partially around an exercise device, the frame including a front portion and a rear portion;

a pair of front pulleys coupled to the front portion;

a pair of rear pulleys coupled to the rear portion;

a first cable passing through a first of the pair of front pulleys and through a first of the pair of rear pulleys;

a second cable passing through a second of the pair of front pulleys and through a second of the pair of rear pulleys, the first and second cables configured to couple with a user positioned between the first cable and the second cable and between the pair of the front pulleys and the pair of the rear pulleys to unload a portion of the user's weight as the user exercises on the exercise device;

a first lower load cell connected to an end of the first cable;

a second lower load cell connected to an end of the second cable;

a first upper load cell connected to the first of the pair of front pulleys or the first of the pair of rear pulleys;

a second upper load cell connected to the second of the pair of front pulleys or the second of the pair of rear pulleys; and

a controller in communication with the load cells, wherein the controller is configured to obtain data from the load cells to determine an amount of unloading of the user when the user is coupled to the first and second cables, wherein each pulley of the pair of front pulleys is mounted to a load cell piston to indicate force acting on each pulley.

2. The unweighting system of claim 1 , further comprising third and fourth lower load cells connected to ends of the first and second cables opposite to the ends connected to the first and second lower load cells.

3. The unweighting system of claim 1 , further comprising third and fourth upper load cells such that each of the pulleys includes an upper load cell connected thereto.

4. The unweighting system of claim 1 , wherein the controller is configured to determine the amount of unloading of the user by determining a difference in readings between the upper load cells and the lower load cells.

5. The unweighting system of claim 1 , wherein each pulley of the pair of rear pulleys is mounted to a load cell piston to indicate force acting on each pulley.

6. The unweighting system of claim 1 wherein while the portion of the user's weight is unloaded, the first cable and the second cable are configured to be coupled at or near the user's waist.

7. The unweighting system of claim 1 wherein a spacing between the pulleys of the pair of front pulleys is wider than a spacing between a location where the first cable is coupled to the user and a location where the second cable is coupled to the user.

8. The unweighting system of claim 1 wherein a spacing between the pulleys of the pair of rear pulleys is wider than a spacing between a location where the first cable is coupled to the user and a location where the second cable is coupled to the user.

9. The unweighting system of claim 1 wherein while the portion of the user's weight is unloaded, the first cable and the second cable are configured to be clipped to the user.

10. The unweighting system of claim 1 wherein while the portion of the user's weight is unloaded, the first cable and the second cable are configured to be hooked to the user.

11. The unweighting system of claim 1 further comprising a user support configured to be worn by the user wherein the first cable and the second cable are configured to be coupled to the user by the user support.

12. The unweighting system of claim 11 wherein the user support is a pair of shorts.