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A leg exercise apparatus having a supporting frame, a leg disposition assembly and a connecting panel. The supporting frame is pivotably connected to the leg disposition assembly, and an upper portion of the connecting panel is pivotably connected to the leg disposition assembly on its backside. A p

A leg exercise apparatus having a supporting frame, a leg disposition assembly and a connecting panel. The supporting frame is pivotably connected to the leg disposition assembly, and an upper portion of the connecting panel is pivotably connected to the leg disposition assembly on its backside. A positioning bar passes through a lower portion of the connecting panel and is disposed in positioning grooves located on both arms of the supporting frame to secure the connecting panel. An end opening is located at an end of the supporting frame and connects to two tunnel grooves at both arms so the positioning bar can be pushed out through the tunnel grooves and end opening, which leads the leg disposition assembly to collapse into the supporting frame to form a compact and portable leg exercise apparatus.

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1. A leg exercise apparatus comprising: a supporting frame having a receiving space defined by a base, an end portion plate, and first and second substantially parallel arms that extend from opposite sides of the end portion plate, wherein at least a first positioning groove is formed in an inner su

1. A leg exercise apparatus comprising: a supporting frame having a receiving space defined by a base, an end portion plate, and first and second substantially parallel arms that extend from opposite sides of the end portion plate, wherein at least a first positioning groove is formed in an inner surface of the first arm and at least a second positioning groove is formed in an inner surface of the second arm;a leg disposition assembly pivotably mounted to the supporting frame, wherein the leg disposition assembly has a foot platform and a heel rest;a connecting panel pivotably mounted to the leg disposition assembly at one end and having a positioning bar extending from another end, andfirst and second tunnel grooves formed in an inner surface of the first and second arms adjacent the end portion plate and into which opposing ends of the positioning bar are configured to extend, the tunnel grooves opening into a gap formed between the end portion plate and the base that defines an end opening through which the positioning bar protrudingly extends to form a hand-grippable handle when the leg disposition assembly collapses into the receiving space;wherein the positioning bar's opposing ends are configured to be disposed in the first and second positioning grooves to secure the connecting panel to the supporting frame and fix an angle of the foot platform relative to the supporting frame;wherein a plurality of slots are formed on both sides of the foot platform, and a pair of hooks are located at the backside of the heel rest to engage with the slots to determine the heel rest's position on the foot platform. 2. The leg exercise apparatus of claim 1, further comprising a panel opening formed in the connecting panel for a user to extend a hand through the panel opening and grip a portion of the positioning bar to carry the leg exercise apparatus. 3. The leg exercise apparatus of claim 1, wherein the angle of the foot platform is adjusted by disposing the positioning bar in different positioning grooves located at the inner surface of the first and second arms. 4. The leg exercise apparatus of claim 3, wherein the foot platform is at an angle of about 55 degrees. 5. The leg exercise apparatus of claim 1, wherein a connecting portion extends from the leg disposition assembly to pivotably connect to the first and second arms of the supporting frame. 6. The leg exercise apparatus of claim 1, wherein the leg exercise apparatus is made of a material selected from metal, wood, and composite material. 7. A method of a physical therapist conducting physical therapy with a patient in a wheelchair, comprising the steps of: (a) providing a leg exercise apparatus comprising: (i) a supporting frame having a receiving space defined by a base, an end portion plate, and first and second substantially parallel arms that extend from opposite sides of the end portion plate, wherein at least a first positioning groove is formed in an inner surface of the first arm and at least a second positioning groove is formed in an inner surface of the second arm;(ii) a leg disposition assembly that is pivotably connected to the supporting frame and has a foot platform and a heel rest at a front surface thereof;(iii) a connecting panel pivotably connected to the leg disposition assembly at one end and having a positioning bar extending from another end, and(iv) first and second tunnel grooves formed in the inner surfaces of the first and second arms, respectively, adjacent the end portion plate, the tunnel grooves opening into a gap formed between the end portion plate and the base that defines an end opening;(b) placing the leg exercise apparatus on a floor and the end portion plate thereof against a stable surface;(c) disposing opposing ends of the positioning bar in the first and second positioning grooves to secure the connecting panel to the supporting frame and fix an angle of the foot platform relative to the supporting frame;(d) the physical therapist exerting a force on the wheelchair while the patient sits in the wheelchair with the patient's feet placed on the foot platform of the leg disposition assembly, the force tending to push the wheelchair toward the wall surface and bend the patient's legs;(e) the patient exerting a counterforce against the force using leg muscles tending to straighten the legs;(f) repeating steps (d) and (e);(g) sliding the opposing ends of the positioning bar through the tunnel grooves to collapse the leg disposition assembly into the receiving space and protrudingly extend the positioning bar through the end opening to form a hand-grippable handle; and(h) grasping the hand-grippable handle. 8. The method of conducting physical therapy of claim 7, further comprising the therapist adjusting a heel rest's position on the foot platform. 9. The method of conducting physical therapy of claim 7, further comprising: (a) the physical therapist extending his hand through a panel opening formed near a center of the connecting panel;(b) the physical therapist grasping the positioning bar; and(c) the physical therapist carrying the leg exercise apparatus. 10. The method of conducting physical therapy of claim 9, further comprising the physical therapist cleaning the leg exercise apparatus after use and carrying it to a next patient. 11. The method of conducting physical therapy of claim 7, further comprising the therapist adjusting the angle of the foot platform of the leg disposition assembly by disposing the positioning bar in third and fourth positioning grooves located at the inner surface of the first and second arms.