Cross a weighted ball with a giant rubber band, and you get a workout that strengthens underused muscles while stretching overused ones. Helena Collins's resistance-training classes leave you long and lean, but these sessions are no slog — they're so festive, in fact, there's often a waiting list. RUNNERS-UP: Dennis Goldsmith, Sports Club/LA and Boston Sports Club; Claudia Busto, Boston Sports Club
Life in Synergy, 867 Boylston St. 2nd Floor Boston, MA 617-867-6500 lifeinsynergy.com
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