referring now to the drawings with more specificity , the preferred embodiment of the present invention essentially provides an exercise device 10 for exercising core muscle groups with an eye toward improving overall posture , particularly cervical curve posture . proper cervical curve posture as at 102 is generally depicted in fig3 ( a ), 3 ( b ) and 10 . it will be noted from an inspection of the noted figures that a standard or proper cervical curve 102 comprises a standard or typical radius of curvature with minimal or negligible forward lean ( as at 116 ). fig9 , by comparison , depicts improper forward lean ( as at 115 ) at the cervical curve , which the present invention is designed to correct or remedy . the present invention is thus designed with a view toward correcting the cervical posture depicted in fig9 and for maintaining the cervical posture 102 depicted in fig3 ( a ), 3 ( b ), and 10 . the core exercising device 10 according to the present invention preferably comprises a bar element as at 11 ; bar sheathing as at 12 ; opposed end caps as at 13 ; a pad element as at 14 ; and a pad sheathing or cover as at 15 . the bar element 11 is preferably cylindrical in geometry and constructed from a weighty bar material such as steel and has opposed bar ends , a preferable bar length ( as at 100 ) of 36 inches intermediate the bar ends , and a select bar diameter as chosen or selected from a number of diameters depending on the user &# 39 ; s physique and capability . the weighty material of the bar element preferably has a material density on the order of 4 . 54 ounces / in 3 . in other words , given a preferred length of 36 inches for each bar element 11 , it is contemplated that a variety of weights may be made available depending on the user &# 39 ; s physique and capabilities . since the material has a uniform or consistent average density , the preferred method for altering or differing the downwardly directed weight 110 across the varied bar elements 11 is to change the diameter or cross - sectional area of each bar element 11 . recall that preferred material density for the bar element 11 is on the order of 4 . 54 ounces / in 3 . it is thus contemplated that a first bar element 11 may comprise a diameter on the order of 1 . 5 inches and weighs approximately 288 ounces ( 18 pounds ); a second bar element 11 may comprise a diameter on the order of 1 . 40 inches and weighs approximately 256 ounces ( 16 pounds ); a third bar element may comprise a diameter on to the order of 1 . 3 inches and weighs approximately 224 ounces ( 14 pounds ); a fourth bar element 11 may comprise a diameter on the order of 1 . 2 inches and weighs approximately 192 ounces ( 12 pounds ); and a fifth bar element 11 may comprise a diameter on the order of 1 . 1 inches and weighs approximately 160 ounces ( 10 pounds ). the foregoing figures are based on the preferred cylindrical geometry for each bar element 11 with a constant length of 36 inches . the formula for the volume of a cylinder is as follows : where “ π ” is a constant , “ r ” is the radius of the cylinder , and “ h ” is the height or length of the cylinder . with a relatively constant material density of 4 . 54 ounces per cubic inch or 490 pounds per cubic foot , it is contemplated that devices 10 ranging from 10 to 18 pounds in 2 pound increments may well be described by the foregoing descriptions . the pad element 14 is preferably cylindrical in form and constructed from a high memory foam material relatively lightweight ( or negligible in weight ) as compared to the bar element 11 . the pad element 14 has opposed pad ends and a preferred pad length ( as at 101 ) of about 12 inches or shoulder width , or a third the length of the bar length as at 100 . the pad element 14 further comprises a cervical curve - accommodating or receiving outer pad diameter ( as at 104 ) preferably on the order of 3 . 6 inches ( and thereby effecting a radius of curvature on the order of 1 . 8 inches ); a bar - receiving , inner pad diameter as generally and variably referenced at reference numerals 105 - 109 ; and a bar - receiving slot as at 16 . the inner pad diameter ( s ) define a bar - receiving tunnel as at 17 . it is thus contemplated that the dimension or diameter referenced at 105 may represent a diameter on the order of 1 . 5 inches ; the dimension or diameter referenced at 106 may represent a diameter on the order of 1 . 4 inches ; the dimension or diameter at 107 may represent a diameter on the order of 1 . 3 inches ; the dimension or diameter at 108 may represent a diameter on the order of 1 . 2 inches ; and the dimension or diameter at 109 may represent a diameter on the order of 1 . 1 inches . it will be noted that the select bar diameter ( as generally and variably referenced at reference numerals 105 - 109 ) is substantially equal in magnitude to the inner pad diameter ( as generally and variably referenced at reference numerals 105 - 109 ). this structural feature prevents axial displacement of the pad element 14 relative to the bar element 11 , there being sufficient friction between the elements 11 and 14 to prevent axial movement of one element relative to the other element . the bar element 11 is preferably received in the pad element 14 such that the two cylindrical elements are coaxial . further , the bar element 11 is received in the pad element 14 via the bar - receiving slot 16 such that the pad element 14 is centered along the bar length 100 equidistant from the bar ends as generally depicted in fig4 , 6 , and 7 . it may be seen from a further inspection of fig3 ( a ) and 3 ( b ) that the outer pad diameter 104 is specifically sized so as to accommodate or be finely received in a user &# 39 ; s cervical curve for providing tactile information to the user as to how or to what degree the user &# 39 ; s cervical curve should be adjusted so as to approximate the radius of curvature of the outer pad diameter 104 . together the muscular activity associated with resistance training as operating against the downwardly directed weight 110 ( which resistance training is generically represented by vectors 111 ) and the fixed outer pad diameter 104 ( resulting in a radius of curvature that substantially matches that of a standard cervical curve ) operate to strengthen the core muscles associated with improving and / or maintaining correct posture , particularly correct cervical curve posture . as earlier specified , the core exercising device 10 according to the present invention may preferably comprise both bar sheathing 12 and pad sheathing 15 so as to provide an interface between the user &# 39 ; s body and the underlying material constructions . in other words , the sheathing 12 and / or 15 prevent contact with the underlying material constructions . in this regard , the bar sheathing 12 may be preferably constructed from a cushion - like material and may thus cushion - coat the bar element 11 . end caps 13 prevent the bar sheathing 12 from becoming disengaged from the bar element 11 . the pad sheathing 15 further provides a function of sealing the bar - receiving slot 16 for preventing disassembly of the pad element 14 from the bar element 11 . notably , since the pad sheathing 15 comes into regular contact with the user as generally depicted throughout the drawings supporting this specification , it is contemplated that the pad sheathing 15 is preferably removable from the pad element 14 and constructed from a washable material for properly maintaining the core exercising device 10 . in this regard , it is contemplated that the pad sheathing 15 may comprise hook type fastening material as at 18 cooperable with loop type fastening material as at 19 . together the hook and loop fastening material 18 / 19 ( e . g . velcro brand hook and loop fastening material ) may function to removably fasten the pad sheathing 15 about the pad element 14 . alternatively , the pad sheathing 15 may comprise ties as at 20 for removably binding the pad sheathing 15 about the pad element 14 . while the above description contains much specificity , this specificity should not be construed as limitations on the scope of the invention , but rather as an exemplification of the invention . for example , it is contemplated that the present invention essentially provides a core exercising device ( as at 10 ) for improving posture , which core exercising device essentially comprises a bar element ( as at 11 ) and a pad element ( as at 14 ). the bar element is preferably constructed from a weighty bar material and has opposed bar ends , a bar length intermediate the bar ends , and a select bar volume . the weighty material has a preferred material density on the order of 4 . 54 ounces / in 3 . the pad element , by contrast , is constructed from a lightweight pad material relative to the bar material . the pad element further comprises a pad length , a cervical curve - accommodating , outer pad diameter , and a bar - receiving inner pad tunnel as at 17 . the inner pad tunnel 17 receives the bar element such that the pad element is centered along the bar length equidistant from the bar ends . the outer pad diameter defines a radius of curvature substantially on par or equal in magnitude to the radius of curvature for a standard or normalized cervical curve . the weighty material exercises or trains the user &# 39 ; s core muscles . together , the outer pad diameter and the weighty material function to improve , correct , and / or maintain the user &# 39 ; s posture generally , and the user &# 39 ; s cervical curve posture , particularly . the foregoing specifications are further believed to support certain methodology for improving posture , which posture improving method is believed to essentially comprise the steps of providing a weighted bar ( e . g . as at 11 ), which bar has a bar length and a downwardly directed weight ( e . g . as at 110 ). the bar is then outfitted with a pad ( e . g . as at 14 ), which pad comprises an outer pad diameter or radius of curvature substantially equal in magnitude to the radius of curvature of a standard cervical curve . the pad is axially centered relative to the bar length and substantially shoulder width comprising opposed pad ends . the method may be said to comprise the additional step of manually holding the bar with a user &# 39 ; s hands adjacent the pad ends as generally depicted in fig6 and 8 . it may be further seen from an inspection of fig5 and 6 that the pad functions to space the user &# 39 ; s hands at least shoulder width apart . notably , fig5 and 6 depict the neutral position . in this regard , it will be understood from a consideration of the noted figures that the outfitted , weighted bar is anteriorly received adjacent the user &# 39 ; s thighs and there maintained via upwardly directed forces as at 111 . fig3 ( a ), 3 ( b ), 4 and 8 depict the device 10 ( or pad - outfitted bar ) posteriorly received adjacent the user &# 39 ; s cervical curve and there maintained for further resistance training of the core muscles , which resist the downwardly directed weight of the bar thereby functioning to improve posture via resistance training of the core muscles . it will be recalled that the bar may be constructed from a weighty material having a material density on the order of 4 . 54 ounces / in 3 . the bar thus has a select bar volume and the method may be said to comprise the additional step of selecting the select bar volume from the group consisting of 137 inches 3 , 163 inches 3 , 191 inches 3 , 221 inches 3 , and 254 inches 3 . accordingly , although the invention has been described by reference to certain preferred embodiments , and certain methodology , it is not intended that the novel disclosures herein presented be limited thereby , but that modifications thereof are intended to be included as falling within the broad scope and spirit of the foregoing disclosure , the following claims and the appended drawings .
an apparatus for improving posture comprises a bar element and a pad element centered along the length of the bar element . the bar element is constructed from a weighty material so as to provide a significant and constant downwardly directed weight . the pad element is constructed from a relatively lightweight material as compared to the bar material , but has a very specific cervical curve - accommodating , outer pad diameter or outer pad radius of curvature . the outer pad diameter or outer pad radius of curvature substantially matches that of a normal cervical curve . together , the radius of curvature of the pad element and the weight of the bar element provide the user with a weighted template against which the user may align the cervical portion of his or her spine and commence resistance muscle training against the downwardly directed weight for improving core muscle groups for improving and / or maintaining one &# 39 ; s posture .