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Peter Welch’s Gym is located in a converted warehouse on an industrial stretch of Dorchester Avenue. Flush with the success of the gym, where aspiring fighters spar in the ring while crowded classes of young professionals, many new to Southie, sweat through conditioning routines, Welch has just opened a second gym across the alley. In the new space, under the watchful eyes of the various champions painted on a huge mural, Welch hopes to reintroduce boxing to a generation raised on “SportsCenter” helicopter dunks and Xbox games.