Was watching the people last night while I was doing cardio and the ones that were just strolling thru were the treadmillists. Only like 2 of them had any sweat and thats cause they were doing stationary bike before. Not that being sweaty is a good indication they may have been really fit but i doubt it. The speeds they were going was slower than walking for the most part. Walking is a good exercise but you cant reall compare walking on a tread mill and walking outside. The treadmill doesnt curve or twist or decline and the incline is very poor (walking uphills, downhills, turning corners).