kbmoose

I like this. I have found many different types of intervals to do on a treadmill. I usually do sprints, 30-60's or 60-120's. The first number is the seconds I sprint, usually at 11.0 mph and the second number is the seconds I walk, usually at 3.5 mph. My wife does 2 & 2's. She will run fast (almost a sprint) for 2 minutes…

I agree. I see better and quicker results when I run outside, as opposed to on the treadmill. This is not to say that the treadmill is bad, but the incline helps take care of the difference. I always run at least at a 1.0 incline when I use a treadmill.

Ditto.