 Hello welcome to Film My Run, I'm Stephen Cousins. Today I'm going to be calibrating my treadmill. Now many of you may know that I do a lot of running on a program called Zwift. Zwift is an online game, it used to be for cycling but it's now for cycling and running. Get on your treadmill, get a foot pod, you can log in and run in a virtual world. I really enjoy it, I know a lot of people do, but a lot of people have problems with the pace that they're supposed to be running at and calibrating their foot pod and making sure that the treadmill is at the right pace and knowing whether it's right or wrong. Often we do find that treadmills are not entirely accurate and so one way of testing that is with some tape and a tape measure. So here we are inside in my shed in the back garden. You'll see I've got my Zwift set up here and so the treadmill there, I've also got the bike here with the kicker trainer which I don't use as often as I should do. I used to use it an awful lot but now that running is happening on Zwift I do a lot more running on Zwift than I do cycling. So I've got my big TV screen there to watch Zwift, I've got my microphone and my cameras for streaming and here is my treadmill. It's just a basic standard treadmill. Didn't cost me very much money, it's not fancy in any way shape or form which probably means it's more likely to not be very accurate as well. So we're going to try and test that now. So as you can see here I've cut out various bits of tape and stuck them on the treadmill and I've measured the distance between the bits of tape and it turns out that the length of my treadmill belt is 258 centimetres, so two metres 58 centimetres long. So that's the length of my belt. You also notice that I've placed a piece of tape on the edge of the treadmill. So now what I'm going to do is I'm going to run on the treadmill and each time this piece of tape here passes this piece of tape I'm going to count and it counts up to 100 and then we're going to do a little bit of maths. Okay so this is quite difficult doing it by myself so I'm going to have to look down onto the treadmill belt and count the number of times the belt goes round whilst also timing it on my watch and then we do a calculation of 100 multiplied by the belt length divided by the time. Okay so we know that the treadmill belt length is 258 centimetres or 2.58 metres and we know that the time it took me to run 100 revolutions of the belt was 1 minute 45 seconds or 105 seconds so let's do a little calculation. Alexa what is 2.58 multiplied by 100? I haven't finished the question yet. Alexa what is 2.58 multiplied by 100 divided by 105? Okay so the answer let's round it up is 2.46 metres per second. Okay so it's 2.46 metres per second. Alexa what is 2.46 metres per second in kilometres per hour? 8.856 kilometres per hour so we just about 8.9 kilometres per hour interestingly my treadmill was set at 9 kilometres per hour so there may be a margin of error there in my calculations in my measuring of the treadmill belt length or my counting of the revolutions so we could possibly round it up and say that the treadmill is running at 9 kilometres an hour when it says it is and all we could say it's just running slightly under but I've always thought my treadmill is way off so that's a very interesting result that actually the treadmill is not as way off as I think it is so back in the shed I'm going to run the test again I'm going to run for 1 minute at 12 kilometres an hour and count how many revolutions I do so it's slightly different way of doing the test but just to kind of confirm the result that we just got a minute ago so 12 kilometres an hour on the treadmill running for one minute counting okay so let's do that I can't hold the camera while I'm doing this so I'll have to show you in a minute okay so here's the button here's the 12 button here so we press 12 and up we go so that's the set the treadmill now says 12 so that's where I'm going to stop the camera okay there I'll just stop the watch and we counted 76 revolutions so in one minute at 12 kilometres an hour I counted 76 revolutions so let's go back in and ask Alexa the maths questions Alexa what is 2.58 multiplied by 76 divided by 60? Alexa what is 3.268 meters per second in kilometres per hour so you could round that up to 11.8 kilometres an hour so my treadmill is running slightly fast isn't it I am running slower in real life than my treadmill says I'm running so if I set it to 12 kilometres an hour I'm actually running 11.8 kilometres an hour that's what it seems to suggest