Coach Choi, former Korean Featherweight Champion, Asian Pacific Lightweight Champion, and WBA/WBC Number Two Ranked Lightweight, owns and maintains a boxing gym hidden behind Chilkoot Charlie’s, a wonderful bar if you’re up for getting stabbed in the parking lot. Around back, an unmarked door propped open with a dumbbell leads to the gym, where rap music keeps tempo with the thud of leather on leather and the rattle of heavy bag chains.