referring now in detail to the drawings numeral 11 of fig1 is adjustable resistance exercise apparatus . numeral 12 of fig2 is the dissected tubular structure of adjustable resistance exercise apparatus with the intact inner key resistance apparatus to reveal its position inside tubular structure . numeral 13 of fig3 is the components of adjustable resistance exercise apparatus . numeral 14 of fig4 is components of the inner key resistant apparatus . numeral 15 of fig1 and 3 is a rope . numeral 16 of fig1 and 3 is lower cap . numeral 17 of fig2 is dissected lower cap 16 . numeral 18 of fig1 and 3 is top cap . low cap 16 and top cap 18 are preferably identical . numeral 19 of fig2 is dissected top cap 18 . numeral 20 of fig1 and 3 is tunnel of lower cap 16 . numeral 21 of fig1 and 3 is tunnel of top cap 18 . tunnel 20 and tunnel 21 are identical . rope 15 can pass easily through tunnels 20 and 21 . numeral 22 of fig2 and 3 is hook of rope 15 . numeral 23 of fig2 and 3 is ring of rope 15 . hook 22 can hook on ring 23 . hook 22 and ring 23 can easily pass through tunnels 20 and 21 . after squeezing top cap 18 and lower cap 16 inwardly to relax rope 15 one can pull hook 22 and ring 23 of fig2 out of tunnel 20 . numeral 24 of fig1 and 3 is outer tube . numeral 25 of fig2 is the dissected outer tube 24 . numeral 26 of fig1 and 3 is inner tube . numeral 27 of fig2 is the dissected inner tube 26 . outer tube 24 can admit easily and snugly inner tube 26 . inner tube 26 can telescope and slide easily inside outer tube 24 . outer tube 24 and inner tube 26 are preferable to have the same length and overlap each other for about one quarter to one third of their lengths . numeral 28 of fig2 and 3 is the inner key resistance apparatus . numeral 29 of fig2 and 4 is long longitudinal side rod of inner key resistance apparatus 28 . numeral 30 of fig2 and 4 is stopper . stopper 30 is preferably installed at or near the middle portion of inner side of long longitudinal side rod 29 . numeral 31 of fig4 is a sliding lever . numeral 32 of fig2 and 4 is lever arm . numeral 33 of fig2 and 4 is sliding ring . sliding lever 31 of fig2 and 4 has one sliding ring 33 installed at each end . numeral 34 of fig4 is central canal of sliding ring 33 . central canal 34 surrounds long longitudinal side rod 29 and slides easily on it . stopper 30 of fig2 and 4 can stop sliding ring 33 of sliding lever rod of fig2 and 4 . numeral 35 of fig2 and 4 is lower short horizontal rod . numeral 36 of fig2 and 4 is upper short horizontal rod . upper short horizontal rod 36 and lower short horizontal rod 35 are identical and parallel . sliding lever 31 is installed on two long longitudinal side rods 29 in between stopper 30 and lower short horizontal rod 35 . numeral 37 of fig2 and 4 is roller . roller 37 surrounds and rolls smoothly on upper rod 36 . numeral 38 of fig2 and 4 is elastic rubber band . elastic rubber band 38 can be of different elastic stretch power , such as 10 pounds or 15 pounds or 20 pounds etc . numeral 39 of fig2 and 4 is hook . there is one hook 39 installed at each end of each elastic rubber band 38 . hook 39 can hook on lower short horizontal rod 35 and lever arm 32 . numeral 40 of fig2 and 3 is brim of the inner tube 26 . the way to install elastic rubber band 38 is to hook one hook 39 of one elastic rubber band 38 on lower short horizontal rod 35 and then to circle elastic rubber band 38 around roller 37 and then to hook another hook 39 of the same elastic rubber band 38 on lever arm 32 to produce slight tension of elastic rubber band 38 . the more elastic rubber bands 38 are used the stronger the resistance power will be and the stronger elastic rubber band is used the stronger resistance power will be . the length of sliding lever 31 is longer than the outer diameter of inner tube 26 and shorter than the inner diameter of outer tube 24 . the width of inner key resistance apparatus 28 from one outside rim of one long longitudinal side rod 29 to the other outside rim of another long longitudinal side rod 29 is a little bit shorter than the inner diameter of inner tube 26 . therefore the inner key resistance apparatus 28 can be inserted and stored snugly inside inner tube 26 and sliding ring 33 can rest on the brim 40 of inner tube 26 . when top cap 18 and lower cap 16 are squeezed inwardly with two hands brim 40 of inner tube 26 will push sliding ring 33 of sliding lever 31 to stretch elastic rubber band 38 to produce exercise resistance to develop pectorals . when both sides of rope 15 are pulled outwardly with both hands brim 40 of inner tube 26 will also push sliding ring 33 of sliding lever 31 to stretch elastic rubber band 38 to produce exercise resistance to develop deltoids and back muscles . the user can use one foot or two feet to step on one side of rope 15 and use one hand or both hands to pull upward another side of rope 15 to develop biceps and quadriceps . by adding more or removing some elastic rubber band 38 the resistance power will increase or decrease . by replacing the weaker elastic rubber band 38 with stronger elastic band 38 the resistance power will increase and vice versa .
the adjustable variant resistance exercise apparatus has installed several different resistant elastic springs and can provide variety of resistance for exercise . man , woman , boy and girl can share the same one of adjustable variant resistance exercise apparatus for exercise . user can upgrade or downgrade exercise resistant power by adding more or remove some elastic rubber bands for exercise .