referring initially to fig1 , a back stretching apparatus 10 includes a base 12 on which a person can lie . the base 12 is generally parallelepiped - shaped and may be made of a suitable preferably rigid material such as aluminum , carbon fiber material , or plastic . as shown , the base 12 includes a rectangular periphery 14 and in one implementation an upper padded surface 16 is bounded by the periphery 14 . in other embodiments the upper padded surface 16 can extend completely to the edges of the base 12 . referring briefly to fig2 , an example upper padded surface 16 can include upper and lower layers 18 , 20 of foam material covered by a protective vinyl cover 22 , with the lower layer 20 being positioned against a bottom plate 24 of the base 12 and with the vinyl cover being substantially co - planar with the top surface of the periphery 14 of the base 12 shown in fig1 . if desired , the base 12 may include left and right portions 12 a , 12 b that can be connected at a hinge joint 26 and that can be folded away from each other as shown in fig1 into a therapy orientation in which the base 12 is oriented horizontally relative to the ground , upper padded surface 16 facing up . the portions 12 a , 12 b can be folded toward each other as indicated by the arrow 28 with the first portion 12 a being folded flat against the second portion 12 b for compact stowage . the portions 12 a , 12 b may be the same size as each other or one portion may be smaller than the other portion . to raise the upper padded surface 16 higher above the ground for the convenience of the user than it otherwise would be , four rigid vertical legs 30 can be provided at each corner of the base 12 to support the base 12 above the ground in the therapy orientation . if desired , as illustrated by the arrows 32 the legs can be hinged to the base 12 so that the legs 30 are foldable between the vertical configuration shown , in which the legs 30 are perpendicular to the upper padded surface 16 of the base 12 , and a horizontal configuration , in which the legs 30 are folded flat against the bottom 24 of the base . fig1 shows that left and right rigid foot bars 34 , 36 are arranged at a first end of the base 12 and are and oriented vertically to extend above the upper padded surface 16 when the base 12 is in the therapy orientation . the foot bars 34 , 36 may also be hingedly joined to the base if desired to fold down against the base for compact stowage , or may be removably joined to the base for the same purpose . in any case , the left and right foot bars 34 , 36 are located along the first end and spaced laterally from each other ( preferably at each left and right edge of the base ) such that a person lying supine on the upper padded surface of the base can place his left and right feet respectively against the left and right rigid foot bars . the foot bars 34 , 36 may be separate structures as shown or may be left and right portions of a single plate - like structure . cross - referencing fig1 and 3 , elongated left and right elastic plastic or rubber members 38 , 40 such as bands each have respective foot ends 38 a , 40 a attached respectively to the left and right foot bars 34 , 36 . the left and right elastic members 38 , 40 each define a respective waist end 38 b , 40 b opposite the respective foot end 38 a , 40 a , with each left and right elastic member 38 , 40 being materially biased to a short configuration in which the elastic member 38 , 40 defines a first length and being stretchable to an elongated configuration in which the elastic member 38 , 40 defines a second length longer than the first length . as also shown in fig1 , a waist belt 42 is connectable to the left and right elastic members 38 , 40 at substantially diametrically opposite locations 44 , 46 on the waist belt . by “ substantially diametrically opposite ” is meant between an angular difference of ninety degrees and two hundred seventy degrees , although locations other than substantially diametrically opposite may be used . the waist belt 42 is configured for snug placement around the waist of a person , and may include a detaching mechanism 48 such as a buckle to join and unjoin the ends of the waist belt at the buckle . it may now be appreciated that a person wearing the waist belt 42 around his waist and lying supine on the upper padded surface 16 of the base 12 when the base 12 is in the therapy orientation with the left and right elastic members 38 , 40 interconnecting the waist belt 42 and the left and right foot bars 34 , 36 can place his left and right feet against the left and right foot bars 34 , 36 , respectively , and push his feet against the left and right foot bars 34 , 36 to urge the elastic members 38 , 40 toward the second ( stretched ) configuration , thereby placing a force on the person &# 39 ; s lower back . in example embodiments , as best illustrated in fig3 a respective foot eyelet 50 is engaged with the foot end of each elastic member and a respective waist eyelet 52 is engaged with the waist end of each elastic member . the eyelets may be metal posts terminating in closed rings , with the posts being embedded in the elastic member , although other eyelet structure may be used . also , right and left belt eyelets 54 , 56 ( in the example shown , loops of cord passed through the belt ) can be arranged on the waist belt 42 , and the waist eyelets 52 of the elastic members are engageable with respective belt eyelets of the waist belt using respective left and right belt connectors 58 , 60 . in the non - limiting example shown the belt connectors are s - shaped , it being understood that other connectors such as but not limited carabiner - type clips or other clipping or connecting structure such as detent and cavity connectors may be used , preferably so long as connection and disconnection is rendered simple and easy . also , left and right foot eyelets 62 , 64 may be arranged on the left and right foot bars 34 , 36 . the foot eyelets 62 , 64 may be metal posts terminating in closed rings , with the posts being threaded into a respective opening 66 in the foot bar 34 / 36 . if desired , each foot bar may include plural openings 66 spaced vertically from each other along the foot bar as shown , with each of the openings being engageable with a foot eyelet of the foot bar , such that a person can selectively engage a foot eyelet of each foot bar at a desired opening of the foot bar to thereby establish the elevation of the foot end of the respective elastic member . or , each opening 66 may be provided with a respective eyelet 66 a as shown . in any case , the foot eyelets 50 of the elastic members 38 , 40 are engageable with respective foot eyelets 62 , 64 of the foot bars 34 , 36 , in the non - limiting example shown using respective left and right foot connectors 68 , 70 that , like the other connectors , may be s - shaped connectors or other appropriate connectors . to instruct a person how to use the apparatus 10 , a substrate 72 may be provided bearing instructions which instruct a person to lie flat on the upper surface 16 of the horizontally - oriented base 12 , don the waist belt 42 by fastening it around the person &# 39 ; s waist , and connect respective first ends of the left and right elastic members 38 , 40 to the respective left and right foot bars 34 , 36 above the upper surface of the base . the instructions may also instruct the person to connect left and right segments ( e . g ., the loops 54 , 56 ) of the waist belt 42 to respective second ends of the left and right elastic members 38 , 40 , and then push his feet against the foot bars to thereby push his head away from the foot bars to provide a force on the person &# 39 ; s back . in some embodiments the instructions may further advise the person to select a vertical location on the foot bars at which to attach the first end of each respective elastic member by means of the spaced openings 66 and eyelets 62 / 66 a . the person may also be instructed to vary a force applied to the foot bars from leg to leg to thereby move an axis of stretch against the person &# 39 ; s back . while the particular back stretching machine is herein shown and described in detail , it is to be understood that the subject matter which is encompassed by the present invention is limited only by the claims .
an apparatus for stretching the lower back . a person lie supine on a horizontal padded surface at the end of which are two vertical rigid foot bars . the person wears a waist band around his waist and connects the waist band to left and right elastic members , each of which is connected to a respective foot bar . by pushing his feet against the foot bars , the person pushes the remainder of his body away from the foot bars , thereby stretching the elastic members and imposing a therapeutic force on his lower back .