1. Field of the Invention
This invention relates to an exerciser, more particularly to a hand-held exerciser.
2. Description of the Related Art
Referring to FIG. 1, a conventional exerciser is shown to comprise a fixed body 1, a movable body 2, a coiled spring 3 and a spring adjustment device 4. The fixed body 1 has an elongated base plate (1a), an upright outer tube (1b) connected to the base plate (1a) at its lower end, and a fastening device (1c) which is mounted under the lower end of the outer tube (1b) in order to connect rotatably the outer tube (1b) to the fixed body 1. The lower side of the base plate (1a) defines substantially a planar, flat support surface in order to be disposed stably on the ground. The movable body 2 has a transverse press bar (2a) and an inner tube (2b) connected perpendicularly to the transverse bar (2a) at its upper end. The lower portion of the inner tube (2a) is received slidably in the outer tube (1b). The coiled spring 3 is disposed in the inner tube (2a). The spring adjustment device 4 has a threaded rod (4c) which has a head (4d) that engages a rotary knob (4a), and a nut member (4b) connected to its lower end. The spring force of the coiled spring 3 can be increased or decreased by means of rotating the rotary knob (4a) and thereby the threaded shaft (4c), causing the nut member (4b) to move relative to the threaded shaft (4c) and to compress or release the coiled spring 3.
In use, the user may place the base plate (1a) of the fixed body 1 on the ground and depress the movable body 2 downward against the spring force of the coiled spring 3 for exercising purposes. However, because the weight of the user's body facilitates the depression of the movable body 2 when the user normally bends his/her body to depress the movable body 2 downward by means of arms, the user cannot simply exercise his/her arms by means of the conventional exerciser.