What is your favorite piece of exercise equipment?

LOVE the new bike at the gym - Expresso Fitness - FUN!  I totally look forward to working out on it!  

The Gazelle is number 1. Then the mp3 to go with it.

I love the ArcTrainer.  I had so much pain in my feet from using the treadmill.  The ArcTrainer helps me to get my heart rate up and there is little impact on the bottoms of my feet so I don't have to hobble to the bathroom in the mornings!  I would have to agree with the poster who listed the personal trainer though.  Without her, I would not have known about the ArcTrainer, or any of the other great strength-training equipment she has me on.