Kevin Bull, former star of 'American Ninja Warrior,' inside Dojoboom at Janss Marketplace in Thousand Oaks.

Kevin Bull, former star of 'American Ninja Warrior,' inside Dojoboom at Janss Marketplace in Thousand Oaks. Photo by Mike Baker

Kevin Bull has a simple goal: Provide high-energy, adrenaline-pounding recreation in a shopping mall...

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