Unnata Aerial Yoga, New York

Instead of setting up shop inside a brick-and-mortar building, Classtivity stretches its fitness-bestowing reach throughout five cities, inviting people to burn calories, tone muscles, or find inner peace—all on their own schedule. Students simply search for the type of class they wish to take, such as yoga, cardio dance, or strength training, along with the time, price range, and location, before booking it online. With hundreds of activities and 20,000 available classes, the right class is always just around the corner. The company even includes classes in artistic pursuits such as guitar and painting. Classtivity’s CEO and founder Payal Kadakia sums up the business’s philosophy succinctly: “Because finding a class shouldn’t be harder than taking one.”