Abstract: A conditioning hammer of unitary construction, one end of the hammer being formed in a handle and the other end having longitudinal bifurcating slits creating a plurality of rods. The depth of the slits between the rods as well as the widths of the slits are varied in order to obtain different degrees of rigidity for use when impacting ones body to condition and desensitize a predetermined area. The hammer is rectangular and therefore different sides of the rods are of varying widths in order to increase or lessen the impact area.