The HZ Fishing Jar can be fired up or down multiple times simply by pushing or pulling on the immobilized tool string. A very low re-cocking force makes this design ideal for horizontal wells where pushing capabilities are limited. The impact of the fishing jar can easily be controlled by varying the applied force. No pre-setting or adjustments are needed before tripping in hole or prior to jarring. A large thru bore is incorporated allowing ball actuated tools to be run below the jar.