BROOKLYN —

After two hours of training clients, Heather Hardy begins the meticulous process of wrapping her own hands, knuckle by knuckle with the black cloth that protects her fists. This will be a shorter “learning” session to correct her technique before a more intense workout later in the day.

Though she’s in the home stretch of preparations for her September 13 fight at The Theater at Madison Square Garden against Amanda Serrano, she can’t get away from her day job.

“This isn’t my full time job,” says Hardy, 37, after cooling down at Gleason’s Gym in the DUMBO section of Brooklyn, a couple of weeks ago.

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