Mobile training device

1. A mobile training device, comprising:

a) a upright frame, including at least one guide opening located on a front cover of the frame;

b) at least one releasable clamp fixed to the upright frame;

c) a base connected to the upright frame, wherein the base including at least one front leg and at least one back leg, the back leg having at least one roller;

d) at least an elastic rope releasably engaged with the clamp and extending from the guide hole, wherein a hook is attached to the end of the elastic rope; and

e) a training belt adjustable in length, wherein the training belt has at least one ring to be engaged with the hook;

wherein resistive force is variably provided by the elastic rope, and wherein the elastic rope, by engaging through the guide hole with the ring on the training belt worn by a user, is at an angle θ to the surface on which the user is standing such that the variable resistance has both a horizontal component and a vertical component.

2. The mobile training device of claim 1 , wherein the base has two front legs and two back legs, and each of the back legs has a roller.

3. The mobile training device of claim 1 , wherein the training belt has at least one first ring and at least one second ring, wherein the first ring and the second ring are spaced apart on the training belt.

4. The mobile training device of claim 3 , wherein the upright frame has a first guide opening and a second guide opening, and the first guide opening is vertically higher than the second guide opening.

5. The mobile training device of claim 4 , wherein the mobile training device comprising a first elastic rope having a first hook and a second elastic rope having a second hook, and wherein the first hook being engaged to the first ring and the second hook being engaged to the second ring on the training belt.

6. The mobile training device of claim 4 , wherein the upright frame further comprising a first ring near the first guide opening and a second ring near the second guide opening.

7. The mobile training device of claim 1 , further comprising a tension-measuring means for measuring the tension of the elastic rope.

8. The mobile training device of claim 1 , wherein the upright frame can be folded into the base.

9. The mobile training device of claim 1 , wherein the upright frame is tilted away from the user.

10. The mobile training device of claim 1 , wherein the upright frame is pivotally coupled to the base through a shaft and an arm.

11. The mobile training device of claim 1 , wherein the clamp engages with the elastic rope such that the elastic rope can only be releasbly pulled in the direction away from the user.

12. A mobile training device, comprising:

a) a upright frame, including at least one guide opening located on a front cover and at least one releasable clamp;

b) a base pivotally coupled with the upright frame through an arm fixed on said base and a shaft, wherein the base including at least one front leg and at least one back leg, the back leg having at least one roller;

c) at least an elastic rope releasably engaged with the clamp and existing from the guide hole, wherein a hook is attached to the end of the elastic rope; and

d) a training belt adjustable in length, wherein the training belt has at least one ring to be engaged with the hook;

wherein resistive force is variably provided by the elastic rope, and wherein the rope, by engaging through the guide hole with the ring on the training belt worn by a user, is at an angle θ to the surface on which the user is standing such that the variable resistance has both a horizontal component and a vertical component.