Best of Boston

He’s short, fit, funny, and warm— he’s human. More realist than Robocop, John is a hard-driving motivator who makes you laugh before, while, and after you sweat. From careful but energized aerobics for ladies who show up at 9 a.m. to all-out, kick-ass sessions for the evening hard-bodies, all his classes are jammed. Get there early— they fill up fast.