Hi, today I did W2 R3 but decided to have a go on my treadmill as I noticed a few others on here do a mix of both so thought I would give it a go. I set my walking speed at only 3.5 and my running speed at 5.0. I changed the speeds manually and it was difficult to keep up the momentum while changing them so I know I will have to program it to do intervals, but I just wanted some advise on what speeds would be the best. I found it ok at that speed and my recovery rate after the jogging was well within the 2 min walk stage, and I found it easier to do on the treadmill than even though I was walking & jogging faster than when I am outdoors. I am going to repeat W2 for another week just as I did W1 so would it be ok to increase speed then or stay the same and gradually build it up?