A boxing exercise apparatus is mounted on a stand. A pivoted support arm provides a strike absorbing means. In a first embodiment, the support arm is connected to the stand with a spring joined to a rigid rod. The rigid rod is preferably positioned in a neutral position with an integral positioning means....http://www.google.com.au/patents/US5984842?utm_source=gb-gplus-sharePatent US5984842 - Boxing exercise apparatus with damping adjustment
