I have been to many gyms in the Phoenix area, and Underground has been the best experience. By far. I've been working out with Ron for almost two years and he still manages to keep the workouts fresh, and pushes me to do more -without yelling or screaming. All the trainers are extremely helpful and friendly. Somehow they make working out fun and not something to dread! I'm thankful I found this gem of a gym. I highly recommend Underground!