with respect to the associated supporting bar and in this manner the hand grips may be moved into many different positions relative to the supporting bars for the purpose of carrying out certain exercises it is desirable that the hand grip portions of the hand grips be locked in position with respect to the support portions thereof so that the hand grip portions cannot swivel with respect to the support portions the device is provided with an adjustable locking member 100 formed of steel or the like having a cylindrical portion 102 and a reduced cylindrical portion 104 portion 102 has threads formed on the outer periphery thereof which are threaded into the threaded cylindrical bore 92 of member 90 a bore 106 is formed through member 100 and a surface 108 is formed at one end of the bore surface 108 forming a portion of a spherical surface and being complementary in configuration to and engageable with the surface 77 on member 73 of the hand grip portion of the hand grip four holes 110 are formed through portion 104 at equally spaced points around the periphery thereof when it is desired to lock the hand grip portion in a desired position so that it will not rotate with respect to the support portion of the hand grip member 100 is rotated so that it is threaded into member 90 thereby bringing surfaces 77.