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Top Why Catalyst? cat-a-lyst: an agent that provokes or speeds significant change or action The Catalyst Difference At Catalyst, all of our trainers are real people first and foremost. We don't have fitness robots here. Every trainer at Catalyst has been shaped by their background in fitness and knows just how rewarding it is to be in tune with their body. For us, fitness is a door to a fuller, happier life outside of the gym. It's our goal to share that with you.