We're all for physical fitness (uh . . . in theory, at least), but the treadmill is so damn boring, and lifting weights is for meatheads. So we're stoked on the workout we can get dangling 30 feet in the air at Phoenix Rock Gym. The first trip to the top of the wall is a little scary, but it feels pretty sweet to look down and realize you actually climbed a wall. The best part about this gym ? which offers 15,000 square feet of climbing surface ? is the fact that no experience is necessary to climb. And once you get over the awkward feeling of strapping into the harness, you'll realize even a baby can do it. We mean that: Children as young as 2 years old are welcome to climb. For experienced climbers looking for a challenge, the gym offers walls up to 5.13 skill level (for all you non-climbers out there, that translates to "really hard"). That's neat and all, but we'll stick to the beginners' wall for now until we can develop that elusive thing called upper-body strength.