I'm not a runner but have recently started using the treadmills at the school where my husband teaches. Thanks to a government grant, they have a new fitness room and all staff and their families can use the equipment before or after hours. Shortly after I started using the treadmill, quite by accident, I found a 45 min. interval walking workout in one of my Fitness magazines and gave it a try. Well, I'm addicted now. This is currently my favorite aerobic workout. I change the speed and incline every few minutes which makes the 45 min. whiz right by. For a period of 2 min, this workout even has you walking backwards at a low speed and 15% incline! I Googled a search for additional workouts and have several that I now use. I'm sure a runner could adjust the speed to accomplish the workout that they are looking for from these workouts. As there is no TV in the room, I now take a CD player with me and listen to music which also makes the time fly by. I really try to push myself, am dripping by the end of the workouts, and I just love it. Personally, I feel a treadmill challenges me much more than an outdoor walk/run, and being 58 yrs. old, I appreciate the cushioning of the treadmill. And, because I live in Wisconsin, I'll be able to continue with these workouts throughout the winter.
Nancy