Hammer for physical exercises

Abstract

A hammer for physical exercise is disclosed to include a ball, which has two inflatable inner tubes surrounded by a spherical outer shell and a rigid center tube fixedly fastened to the spherical outer shell, and an operating cord member fixedly fastened to the center tube of the ball for operation with the hands to swing the ball so as to exercise the muscles of the hands and the waist.

1 . A hammer comprising: 
 a ball, said ball comprising a spherical outer shell, two inflatable inner tubes mounted inside said spherical outer shell, and a rigid center tube fixedly fastened to said spherical outer shell; and    an operating cord member inserted through said rigid center tube, said operating cord member having a first knot stopped at one end of said rigid center tube and a second knot stopped outside an opposite end of said rigid center tube.    
   
   
       2 . The hammer as claimed in  claim 1 , wherein one of said inflatable inner tubes has an air valve extended to the periphery of said spherical outer shell.  
   
   
       3 . The hammer as claimed in  claim 1 , wherein said rigid center tube is a ferrous tube.