>> i want to see you moving. change your angle, change your angle. that's shadow boxing, go. final 30, shake it out, go, go, go. brandon, if you end with your right, move to your right. >> my name is tim stanton. i'm a detective for the boston police department. i work out of area b-2. >> he works with youth boxers throughout the city of boston. >> it is a place where kids can learn self-confidence, respect, sportsmanship. it makes them a stronger person not just physically but mentally as well. >> how are you doing? >> respect for stanton's instruction runs high. lieutenant girard bail, head of the gang unit, has brought his son, zach, here to train. his first big fight is in two days. >> i'm not worried about the