It's a completely different experience than anything you are going to do in the gym or on the side of a rock. It's more of a full body experience. Your heart and lungs are being taxed and then your whole sense of balance as well. When people sign up on our trips they need to be able to walk on uneven ground. They start to think about how much uneven ground. I do a lot of walking, but it's actually on the sidewalk or it's on the treadmill. You need to actually be confident and you can develop that in the back country. Walking and strengthening your leg muscles and your ankles by walking in the stable way on rocky terrain. It's interesting. A lot of people miss that and become very well conditioned on our trips, but they haven't gotten that conditioning in the back country and there is quite a big difference.