That being said, they have their place. This week's heat has got me thinking that I may have to break down and resort to one if I want any exercise this weekend. As for winter, I've never been afraid to run in the cold, but then, I've never run outside in Boston in January, either. And of course, for those of us who are parents, a treadmill at home may help one to exercise and keep in running shape while fulfilling parental responsibilities.
Do you use treadmills? Do you find that a mile on a treadmill is "equivalent" exercise to running outside? (I've heard some people say that adding a 1% incline to a treadmill helps to make it more equivalent - true?) How long can you stay on a treadmill before you get bored out of your mind?