referring to the figures , and particularly fig1 and 2 , a preferred embodiment of the instant device is illustrated in fig1 . elements 1 - 2 are twin identical symmetrical cylindrical spheres split longitudinally on both sides and connected together by the appropriately placed connectors ( 13 , 14 , 15 , 16 , 17 , 18 ,) attaching not only the bodies of the device , but also the means ( 5 , 6 ) of which to attach external weights or tensile cables . fig1 illustrates the entire device without internal insulation . all internal as well as external hardware is permanently affixed to the bodies via rivets or other means of attachment . in fig1 loop ( 5 ) passes through ring ( 6 ), creating the method of connection . inserting loop ( 5 ) through ring ( 6 ), and placing loop ( 5 ) between the twin manacles ( 1 , 2 ), rivets ( 16 , 17 , 18 ) are then inserted through manacles ( 1 , 2 ) as well as loop ( 5 ) forming a permanent connection . fig1 illustrates means of which the manacles ( 1 , 2 ) are adapted to the users appendages through the presence of the rachet locks ( 9 , 10 ). the locks ( 9 , 10 ) affixed to manacles ( 1 , 2 ) fixed portions are connected to pivot portions ( 12 ) through cotter pins which allow fixed portions ( 11 ) to be articulated with respect to pivot portions ( 12 ). in order to secure the manacles ( 1 , 2 ) to the users appendages , pivot portion ( 12 ) are received in load receptors ( 19 , 20 ) which are spring loaded and perform the locking function necessary for adherence . once the twin manacles ( 1 , 2 ) are around the subjects appendages , the subject will place the pivot portions ( 12 ) having serrations ( 7 , 8 ) into the spring loaded receptors ( 19 , 20 ) and the subject will continue to insert the serrated tab through until the device becomes snug on the appendage ( s ). the desired weight will then be selected and the tensile cable ( 23 ), will then be secured to the external ring ( 6 ). fig2 depicts an exploded drawing in which the external and internal components are removed . the device consists of twin cuff spheres split longitudinally and equally on either respective side ( 1 , 2 ). the means of attachment ( 5 ) and ( 6 ), contains three respective holes in which permanent attachment ( 16 , 17 , 18 ) can penetrate and secure the bodies and the external means of attachment ( 5 , 6 ). the external means can be connected to either a tensile cable or and other means of resistance . when the cable is connected to the external ring or &# 34 ; external fastener &# 34 ; ( 6 ), the subject can execute any number of isotonic or controlled weighted exercises . the body or &# 34 ; cylinders &# 34 ; ( 1 , 2 ) of fig2 is constructed from a pliable yet durable material allowing it to conform as well as stabilize the lower appendage ( s ). ( 1 , 2 ) contain a number of appropriately placed holes necessary in which to adapt the external hardware . the external hardware consists of external locking mechanisms whether mechanical or other ( 7 , 8 , 9 , 10 , 11 , 12 , 19 , 20 ). the locking component once the apparatus is fitted upon the subjects &# 39 ; appendage ( s ) is secured by insertion of the serrated tab ( 7 , 8 ) through ( 19 , 20 ) until either ends of the respective cuffs are constricted , at this point , ( 9 , 10 ) are pressed down toward the base pulling ( 11 , 12 ) which act as articulating hinges , constricting and allowing the lock to conform to the outer portion of cuff ( 1 , 2 ) securing the apparatus to the subjects appendages . the internal components consist of the method of adaptation to external weighted means ( 5 , 6 ). the portion of nylon or flexible material ( 5 ), penetrates the ring or external means of adaptation ( 6 ), and is placed evenly lengthwise down the median of the twin cuffs . holes or the means of joining the twin cuffs and the pliable fabric containing the external ring is placed down the length of the nylon as well as down the inside of the cuffs . the holes , are then lined up with the holes of both the nylon strip 5 as well as the two cuffs ( 13 , 14 , 15 of fig1 ). the permanent attachments ( 16 , 17 , 18 ) are then inserted securing both the external hardware as well as the twin manacles . upon completion of the above , the insulation ( 3 , 4 ) is then secured through the means of velcro , this allows the subject to remove the insulation when it becomes worn or is no longer pliable , resilient or sanitary . fig . 3 gives an example of the start position of a leg raise to affect a contraction in the abdominal or mid - section . the device is secured to the subject &# 39 ; s appendages ( 40 ) and connected to the external weighted tensile cable ( 23 ) via securing the tensile cable to the external ring ( 6 ) located between the cuffs on the bottom of the apparatus . upon selecting the appropriate weight , the subject is seated on a bench ( 24 ) or any raised means enabling the subject to percure a reclined or relaxed position , and with a upright and controlled lifting motion , raise the legs causing the contraction of the abdominal cavity and causing distal musculature response . by twisting the body in the contraction phase , the oblique as well as the serratus can be contracted these are the surrounding musculature located on the upper and lower sides of the rectus abdominal cavity . fig4 illustrates the additional equipment necessary to facilitate the application of the device to a domestic non - equipped gym environment ( as illustrated in fig5 ). the method of resistance ( 36 ) consists of a weighted rubber elastic band containing a single method of adaptation ( 39 ). one end of the weighted band is inserted through the external attachment ( 41 ) located on the side of ( 35 ). once the band is inserted , it is pulled through half way until it is even on both sides . once this occurs , the end containing the clamp ( 39 ), is looped through and pulled tautly causing a noose and securing the band to the body of the &# 34 ; u &# 34 ; shaped clamp ( 35 ). the &# 34 ; u &# 34 ; shaped clamp is then attached to the bottom of the secured door . ( 37 ) is then tightened down in a &# 34 ; clockwise &# 34 ; manner until the clamp has formed a solid connection to the door . the internal cushioning of the clamp ( 38 ) will prevent any damage to the door . once the locking component is safely attached , the clamp ( 39 ) is connected to the body of the device at the point of affixation ( fig1 item 6 ). the device will then be attached to the subject &# 39 ; s appendages , ( fig3 item 40 ) and the subject may commence the exercising sequence . fig5 illustrates the device being utilized to increase musculature activity within the rectus abdominal and surrounding abdominal cavity . the subject would connect the equipment found in fig4 to the bottom of a properly secured door by placing the &# 34 ; u &# 34 ; ( 35 ) under the door and continue to turn ( 37 ) in a clockwise fashion until ( 38 ) the insulated material comes flush with the surface of the door or secured element . the forementioned device in fig4 consists of a &# 34 ; u &# 34 ; bracket made up of a metal or sturdy and durable material . ( fig4 item 35 ), illustrates the body of the bracket which is lined with a protective material ( 38 ) which will allow application of the bracket to a stationary object such as a door without causing damage to said object . having secured the &# 34 ; anchor &# 34 ;, it is now time to attach the external means of resistance . the weighted band ( 36 ) would be placed through ( 41 ) until both ends are equal . at this point , ( 39 ) would be placed through the opposing end and pulled through forming a &# 34 ; noose &# 34 ;. placing the device on the subjects appendages ( 40 ), and connecting the &# 34 ; clip &# 34 ; ( 39 ) found on the end of the pliable weighted band ( 36 ) to the external ring ( 6 ) of the device , the subject is then ready to complete a series of isotonic abdominal exercises . the subject seated on a raised flat surface ( 24 ), will begin raising the legs in an upright fashion , until a satisfactory contraction is achieved . the ability to diversify the setting and environment in which the device may be implemented lends to it &# 39 ; s uniqueness . the device has further been shown to accomplish an aerobic workout . through the elimination of the weight , the subject can increase his / her pace as well as add rythymic movements . increasing the frequency of the movements while incorporating the use of the upper body in a form of a &# 34 ; crunch &# 34 ;, the heart rate will increase accordingly providing the subject a healthy alternative to an otherwise tedious and monotonous routines . fig6 illustrates the device being used to create a contraction within the posterior portion of the hamstring biceps and surrounding muscles not limited to the gracilis , adductor magnus , semimembranosus , semitendinosus , biceps femoris , vastus lateralis , gluteus maximus and sartorius . the subject attaches the device to his / her appendages just as in completing a abdominal leg raise , but facing down rather than up upon a flat or inclined raised object ( 24 ). the device would then be connected to the subjects appendages ( 40 ) and the tensile cable ( 23 ) would be connected to the external ring ( 6 ). upon selecting the appropriate weight , the subject would lie face - down upon the raised surface . through the selection of an increased angle , the subject can increase resistance and effectiveness to the upper portion of the hamstring biceps . fig6 a illustrates a similar hamstring exercise as fig6 in a domestic setting . utilizing the equipment illustrated in fig4 the resistant elastic band ( 36 ), would be attached to the &# 34 ; u &# 34 ; clamp ( 35 ) secured to the bottom of the door . the clamp located on the band ( 39 ) would then be attached to the ring ( 6 ) located between the two cuffs . the subject will then lie facedown upon a raised , flat , object and initiate pulling the legs in an upward motion and then releasing them at a slow , steady pace . by adjusting the level of the raised surface ( 24 ), the user may orchestrate numerous movements impacting the hamstring along it &# 39 ; s length .