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One of the nation’s hottest gyms isn’t a gym. And it’s free.
Fitness Blender, an online-workout company run by personal trainers Kelli and Daniel Segars, is the most-watched fitness channel on YouTube and just passed 4 million subscribers. That’s more than the number of members at 24 Hour Fitness, one of the nation’s biggest health-club chains.
Fitness Blender’s YouTube channel and corresponding website feature more than 500…