earlier this month, the wife and I took our first White Mts hike, Mt Willard. Being considerably out of shape, this easy (according to AMC guide) hike almost killed us. we were sore for the next couple of days. our goal next year is something a little more challenging. we want to get in better shape for next year. any suggestions on what piece of exercise equipment for best train us? stairclimber, exercise bike, etc?? thanks in advance.