To say boxers don't condition their hands would be false, many do, some using exercises in common with martial arts, others exercises that have been used for many years. I asked my father who boxed in the fifties and early sixties and he said certainly they did conditioning for their hands. I've looked online as well and there are plenty of boxing sites that offer conditioning exercises/drills for boxers. This is just one Top 5 Methods on How to Strengthen Your Hands