I have knee and hip problems, so I run intervals. This is just fine when I run outdoors, but it's starting to get cold in Chicago, and within the next month it's going to be dark both before and after work, so I'd like to buy a treadmill.
I've seen machines that have interval programs preset, like hill intervals or weight-loss intervals. I'm looking for one that will let me input my own intervals. Doesn't have to be fancy - I'm looking for a way to set it up as fast interval = 3 minutes @ x mph, slow interval = 1 minute @ y mph; repeat until I hit stop.
Does a treadmill like this exist? I've tried to explain to the salespeople at my local sporting goods store what I mean by custom intervals, and they just keep pointing me to the machines with the preset workouts.