| 摘要 |
A chest developer which includes a cylinder having a close end made with air holes and an open end sealed with a sealing end cap; and arched fixed handle fixedly secured to the close end outside the cylinder, an arched movable handle; a piston rod having one end fixedly mounted with a piston movable in the cylinder and an opposite end extending out of the sealing end cap and fixedly secured to the arched movable handle; a compression spring mounted within the cylinder and stopped between the piston and the sealing end cap, the compression spring being compressed when the arched movable handle is pulled outwards relative to the arched fixed handle.
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