FIELD OF THE INVENTION 
       [0001]    The invention lies in the field of rehabilitation and exercise devices. 
       BACKGROUND 
       [0002]    Orthopedic physical therapy and athletic training may seek to reduce the amount of joint and muscle strain by countering the effects of gravity upon the body. This can be accomplished by structural supports that the user can rest against. Some suspension frames aim to lift the user, shifting the user&#39;s weight to the suspension frame and off of the ground. Suspension frames are beneficial in the case of lower body rehabilitation because of the reduction of strain on the muscles and joints of the legs. 
         [0003]    Ambulation therapy may be desirable in the case of lower body injuries or neurological damage that compromises the patient&#39;s balance. In addition, ambulation therapy may be useful for athletic training to lower the risk of said lower body injuries. Ambulation therapy devices typically use moving treadmills in combination with a means of suspension. In order to support the full weight of a human body and include a mechanical treadmill for ambulation, these devices are typically extremely heavy and have a large footprint. As a result, they are often too large and too expensive for ordinary consumer purchase. Similarly, modest training facilities, gyms and physical therapy centers may be unable to afford existing therapy device. 
         [0004]    Currently known ambulation therapy devices use air or harnesses for buoyancy. For instance, U.S. Pat. No. 7,341,543 to Dandy discloses an apparatus for shifting the body weight of a runner from the runner&#39;s legs to a wheeled frame using a pelvic harness that is secured to the frame with an elastic material. Another example, the AlterG® Anti-Gravity Treadmill®, suspends the user on an inflatable cushion, which the user must enter into from the top of the machine. Securing the user in these devices can be dangerous, burdensome and inefficient, and moreover, involve straps and fabric that press into parts of the body uncomfortably as the user is suspended above the ground. 
       SUMMARY 
       [0005]    An exercise and physical therapy device is described comprising a suspension frame and garment combination that is easy to enter and comfortable for the user when lifted by the frame. The garment is structured so that it distributes the user&#39;s weight to the frame effectively while minimizing uncomfortable pressure from the garment as the user&#39;s body strains against the garment due to gravity. The garment comprises an elastic fabric such that the user can ambulate freely, and several integrated support panels comprised of a less elastic material, such that due to their resistance to deformation the support panels integrate with the frame and lift the user. The garment comprises thigh support panels that fit the thigh snugly and connect to the suspension frame at waist level, causing the suspension frame to lift the user from the thigh support panels. This alleviates pressure as the user&#39;s body strains against the garment due to gravity, concentrating any squeezing effect at the thigh. Furthermore, the garment comprises a posterior support panel, which connects to the suspension frame at waist level, lifting the user from under the buttocks and counterbalancing the thigh panels that lift the user from the front. 
         [0006]    The device also comprises a wheeled or stationary suspension frame comprising a waist-level ring to which the garment connects, and which is vertically movable. The ring surrounds the user at waist level, attaches to the garment, and can elevate a user wearing the garment slightly off of the ground, thus enabling the user to ambulate while minimizing impact on the user&#39;s lower body. Because the ring is lowerable, the user can safety and comfortably enter the ring and/or step into the garment. 
         [0007]    The frame may be wheeled, or it may be fixed in place such that the user is held in place by the frame. The wheeled embodiment comprises hinges to allow vertical adjustment of the suspension ring. The fixed embodiment may be comprised of a hydraulic suspension ring, or any other means for vertical movement of the suspension ring. In the preferred stationary embodiment, the frame is collapsible, comprising on each side: rotatably connected legs that form an X-frame that expands and collapses due to operation of a mechanical actuator. 
         [0008]    Where the stationary frame is used, the device can also include a low-friction plate that is positionable under the user&#39;s feet, enabling the user to ambulate in place, sliding against the low-friction plate as though it were the ground. The low-friction surface eliminates the need for a costly and oversized treadmill. Furthermore, through the addition of slidable layers of resistance, the friction of the surface may be adjustable. Adjustable friction controls resistance against the user&#39;s feet and therefore can serve as an incremental therapy or training device. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0009]      FIG. 1A  shows a front view of an example of the garment. 
           [0010]      FIG. 1B  shows a side view of an example of the garment. 
           [0011]      FIG. 1C  shows a rear view of an example of the garment. 
           [0012]      FIG. 2  is an example exercise apparatus depicted in use. 
           [0013]      FIG. 3A  is an example of a collapsible suspension frame in an expanded position. 
           [0014]      FIG. 3B  is an example of a collapsible suspension frame in a collapsed position. 
           [0015]      FIG. 4  is an example of a friction-adjustable plate. 
       
    
    
     DETAILED DESCRIPTION 
       [0016]    An example of an exercise apparatus is depicted in  FIG. 2 . Support ring  21  surrounds a user  11  at waist level and is vertically movable by hinges  21  and  23 . With reference to  FIGS. 1A  through  1 C, garment  1  wearable by user comprises a posterior band  4 , a left leg anterior band  8 , and a right leg anterior band  7 . Garment  1  is attachable to support ring  21  such that lifting the support ring suspends the user above the ground. The user is lifted and fixed in place by the support ring, but elasticity of the garment allows ambulatory movement. Because the combination of the garment and frame bear the user&#39;s weight, the user moves without strain on the lower body. 
         [0017]      FIG. 2  shows a friction-adjustable plate  30  positioned under the user&#39;s feet. Because the friction of the pad  30  is adjustable, resistance can be added or subtracted to change the way the user&#39;s feet slide over the pad. The friction-adjustable plate comprises a low-friction surface, such as a surface that has been coated with dry film lubricant, wherein friction can be increased by the introduction of a high-friction material such as rubber or felt. A cloth foot garment may further decrease the coefficient of friction between the user&#39;s feet and the friction-adjustable plate. An example of a friction-adjustable plate is shown in  FIG. 4 , comprising a first layer  33  with openings  31  and a high-friction section  33 , and a second layer  36  with high-friction sections  35  and low-friction section  36 . The second layer  36  is slidable under the first layer  33  such that the high-friction section can be exposed through openings  31 . Increasing the level of exposure of the low-friction section  36  through openings  31  results in increasing the resistance against the user&#39;s feet, while exposing only the high-friction section  35  results in decreasing resistance. An alternative to the two-layer friction-adjustable plate is a single-layer friction-adjustable plate comprising a low-friction material and vertical strips of high-friction material, such that rotating the plate results in increasing the amount of friction against the user&#39;s feet. 
         [0018]    An example of the attachable garment  1  is shown in three views in  FIGS. 1A through 1C . The garment  1  comprises a posterior band  4 , a left leg anterior band  8 , and a right leg anterior band  7 . The posterior band  4  lifts the user&#39;s posterior from the front side of the user&#39;s waist, extending from under the buttocks to the user&#39;s front, where the posterior band  4  can be attached to the support ring  21 . The anterior bands  7  and  8  extend from the user&#39;s right and left front thigh to the back side of the user&#39;s waist, where the anterior bands  7  and  8  are attachable to the support ring  21 . The posterior and anterior bands counterbalance each other, due to the fact that they extend from the front of the frame to the back of the user, and the back of the frame to the front of the user, criss-crossing at the user&#39;s side. The user&#39;s center of gravity is maintained above the ground and the user does not tip forward or backwards when elevated off the ground by the frame. Furthermore, because the bands are less elastic than the rest of the garment, their attachment to the frame creates a structure that lifts the user from the garment itself, distributing the user&#39;s weight to the frame evenly and comfortably. 
         [0019]    Right and left anterior bands  7  and  8  are securable around the leg via right and left braces  2  and  3 , respectively. Braces  2  and  3  are coupled to anterior bands  7  and  8 , respectively, such that when the garment is attached to the frame, the user is lifted by the anterior bands pulling the user up from the braces. By hoisting the user by the thighs and the user&#39;s weight being distributed to the frame via the bands, pressure is alleviated from the crotch, which would typically receive the force of the garment as the garment is hoisted by the frame. Moreover, the right and left braces  2  and  3  may be adjustable to accurately fit the user and to allow the user to adjust for comfort. The braces may be adjustable according to many forms currently known in the art, such as by Velcro as depicted in  FIGS. 1A through 1C . 
         [0020]    In the preferred embodiment, the garment  1  comprises a cloth or cloth-like fabric that is elastic to allow the user full range of movement. The posterior  4  and/or anterior bands  7  and  8  comprise a less elastic material than the rest of the garment  1 , to facilitate weight distribution. For instance, one or more of the posterior and anterior bands may be comprised of materials such as limited-stretch polyester or nylon. Posterior and/or anterior bands may be comprised of a denser weave than the rest of the garment  1 , or the bands may be reinforced with a less elastic material, or the bands may be sewn into the rest of the garment. 
         [0021]    The garment may be attachable to the frame by a variety of known means suitable for hoisting human weight, such as hooks, carabiners, and cam buckles. In the example depicted in  FIGS. 1 through 3 , posterior band  4  is attachable at the front section of ring  21  at attachment points  25  and  27 , anterior band  7  is attachable at the rear section of ring  21  at attachment point  26 , and anterior band  8  is attachable at the rear section of ring  21  at attachment point  24 . Ring  21  surrounds the user at waist level, and is vertically movable such that the user  11  is lifted by the garment attached to ring  21 . 
         [0022]    The frame is vertically movable to suspend the user off of the ground, and lowerable to allow the user to step into the ring  21  with minimal effort. For instance, hinges  22  and  23  can be used to raise and lower the front and rear legs of the frame. In the preferred embodiment, the frame is collapsible as depicted in  FIGS. 3A and 3B . A right ring support  53  is rotatably connected by pin connection  47  to the right leg  51  of frame  20 , while left ring support  54  is rotatably connected by pin connection  48  to the left leg  52  of frame  20 , such that frame  20  is vertically movable by rotation of the supports and legs in their pin connections. By forcing frame  20  away from the right and left ring supports  53  and  54 , actuator rods  45  and  46  rotate the supports and legs in their pin connections to vertically move support ring  21 . The actuator rods  45  and  46  can be operated manually using rotatable knobs  28  and  29 , as depicted, or they can automatically operated. Electronic control unit  39  may be used to facilitate automatic operation of the frame. 
         [0023]    The frame is elevatable to fully suspend the user off of the ground such that the user can walk or run over the ground with less joint and muscle strain. As such, the frame only needs to be capable of suspending the user up to 5 inches off of the ground. The low-friction surface  30  allows the user to ambulate in place within a stationary frame, but the frame  20  may also comprise a front and rear wheel such that the user can push against the ground and move with the wheeled frame with reduced body weight on the user&#39;s legs.
A garment attachable to an exercise or therapeutic apparatus that is capable of elevating the user slightly above the ground, reducing potential for injury and strain by shifting the user's weight to the frame of the apparatus. The garment is incorporated into the apparatus by comprising panels under the buttocks and around the thighs, providing balance and lifting the user comfortably in conjunction with the frame. A low-friction plate is positioned under the user's feet so that the user can ambulate freely while held in place by the frame.