Crossfit Insidious, Mesa

The word "insidious" implies something sneaky—a change that creeps up on you so gradually that it might go unnoticed. It's a bit of a misnomer for a strength-and-conditioning facility that specializes in CrossFit, an intense workout program that achieves fast, noticeable results with exercises that vary constantly. At CrossFit Insidious, students of all fitness levels push, pull, squat, and lift their way through workouts that leave them with empty gas tanks and rippling abdomens. What's remarkable is that they do this without any of the conventional equipment you might expect to find at a big-box gym. To facilitate functional movements that target various muscle groups at once, CrossFit coaches encourage their students to run away from treadmills and toward free weights such as kettlebells, barbells, and Liberty Bells.