BLOCK21 Fitness is a Denver fitness studio centered on cardio dance classes in a lively, welcoming, non-intimidating environment. Founded in 2016 by Sally, the studio grew from a grassroots first class into a close-knit community built around movement, encouragement, and joyful exercise. Classes are open to all fitness levels and require no prior dance experience, with an emphasis on sweating, having fun, and supporting one another rather than pursuing perfection or performance.