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It's that time of year — when subscriptions to weight loss programs and gym memberships spike. But the big box workout chain has a challenger: the boutique gym. According to research by the financial services firm Stephens Inc., in 2015 boutique gyms made up 21 percent of the $22.4 billion U.S. health club market.

The studios feature one-on-one training and group classes including, barre, Pilates and high-intensity interval training. Boutique studios are a hit with millennials and one Los Angeles-based trainer is cashing in.

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