He pulls off his shirt and takes a stance at the bag once again.  He concentrates on his breathing sliding his right leg way back.  He throws a kick that sounds like a shotgun blast on the first one.  He stands back and throws another kick as the bag swings back from his kick.  He keeps the kicks going for 30 seconds, managing to get off 20 kicks in those 30 seconds.  Stepping back he breathes heavy but smiles wide.