Bellows-like exerciser

An exerciser comprising a bellows including an elongated wall body made from a pressible and expandable resilient material and defining a sealed interior chamber therein, said wall body having a first end portion, a second end portion and a plurality of pleated sections located between and integrally formed with said first and second end portions, said first end portion having an axially extending hole formed therethrough and a radially extending circular orifice which is formed through a wall thereof and which has a predetermined diameter for communicating an exterior of said wall body with said interior chamber thereof, so as to permit air to enter into and exit from said interior chamber only via said orifice;

• and a pair of gripping units respectively attached to said first and second end portions of said wall body such that said wall body can be compressed or stretched by applying a force on said first and second end portions so as to vary volume of said chamber in said wall body, thereby enabling a user to achieve an alternate pull and push exercising effect, wherein each of said gripping units includes a tubular adjustment plug that is press-fitted into said axially extending hole of said first end portion and that has a radially extending adjustment hole which is formed through a wall of said plug and which is adjacent to and aligned with said orifice of said first end portion of said wall body, said plug being capable of being rotated within said wall body so as to deflect a portion of said adjustment hole from said orifice, thereby reducing flow rate of air between said adjustment hole and said orifice, and wherein each of said gripping units includes a cover attached to a corresponding one of said first and second end portions of said wall body, one of said covers being attached to said first end portion and having a curved circumferentially extending guide slot formed therein, said plug including guide tongue projecting axially and inwardly therefrom to engage said guide slot so as to confine said tongue in said slot, rotation of said plug relative to said wall body moving said tongue in said slot, engagement of said tongue in said slot registering said adjustment hole with at least a portion of said orifice.