I'm on week 5 and now that I can run a little I've started to think about speed - I want to make sure mine counts as running! I run on a treadmill and just go with what feels comfortable. I've worked up to 7.5 kmph. Most speed related blogs people talk in mph so I'm not sure how I'm doing. I feel I could, maybe, go faster now on the 5 mins, but this week it's working up to 20mins and I don't want to overstretch. Is 7.5kmph reasonable?