The power of 3's

Last night I did some incline stuff on my treadmill at home. I'm getting so close to the end of season 5 of "24". I think this season is a pretty darn good one.

I did a pyramid type incline workout, all at 5mph and 1 minute intervals: 1%, 2%, 1%, 3%, 1%, 4% etc. up to 12% and back down, then back up and down in multiples of 3. Was the multiple of 3 technique some secret formula? Nope; it was just something to get me to an hour long workout.