 Good morning. Welcome to film my run. My name's Steven Cousins. People tell me I am obsessed with strides accuracy and I am or maybe maybe I'm just obsessed with the difference between running on a treadmill and running outdoors. I did this test that I'm going to do today yesterday. I ran five kilometers up the seafront with this measuring wheel and then five kilometers all the way back again. Incredibly, I hit this lamppost here. See this lamppost? This lamppost is where I run from. I arrived back at this lamppost and this measuring wheel said exactly 10,000 meters. Exactly 10,000 meters. Unfortunately, about three kilometers before the end of the run, my camera battery died. So I'm doing it all again today, but at least that means we'll get a double check on the accuracy of the measuring wheel to see if it does do 10,000 meters exactly again. So the idea is we run five kilometers out and five kilometers back. What I'm going to do is I'm going to have two watches on the Phoenix 6s on my right wrist using optical heart rate and the Phoenix 6x Pro on my left wrist using a chest strap for heart rate. Both watches will be using a stride foot pod. The Phoenix 6s on my right hand will be using the old stride foot pod and the Phoenix 6x on my left hand will be using the stride wind, the newer stride foot pod. So two stride foot pods, two Phoenix 6 watches, one measuring wheel. Let's see what we get by the end of the run. Impossible to make a video out of here. Absolutely impossible. Right, both Phoenix 6 watches are using the stride foot pods for distance as well. So distance and pace always from the stride foot pods and they're both at 100% calibration. So essentially zero calibration on both stride foot pods. And one more thing to mention before we start. The distance will be measured by the measuring wheel. So I'm going to run 10 kilometers per hour and I'm going to try to get it to match to the measuring wheel. So when the measuring wheel says 10K, that's when I stop. And hopefully that'll be one hour of running if I can time it correctly. You can see the measuring wheel is set at zero and we're right beside this lamp post here, which is just after the blue bus shelter there. So that's where we're starting from. So when we get back here, I want that to say 10,000 meters exactly. Let's go then. Watch number one. Start watch number one. Start watch number two and away we go running. OK, just past three kilometers and just about 18 minutes, 17 minutes, 56. So I'm not doing too badly, keeping to time with the measuring wheel. So I'm ignoring both watches' distance and time. And I am strictly trying to do six minutes per kilometer according to the measuring wheel. It's more difficult than it looks. So we're on 3,160 meters so far. OK, approaching five kilometers. So we'll see where we turn around. Hopefully I've got this in about half an hour. Six, seven, eight, nine, there's 5,000 meters there. It is about the same as yesterday just before that red bin there, that red refuse bin. So five kilometers back now, we're into the wind a little bit here. Just an update on the stride foot pods. As we found with the track test, the stride wind is measuring long. And the old stride, the non-wind version, is measuring short. It's quite windy coming back, so I think the power number for the stride wind might be quite elevated. And we're about approaching seven and a half kilometers in there. Eight, nine kilometers in 54 minutes, exactly. Six minutes more running to get to 10 kilometers. OK, moment of truth time. We're just coming up to the bus shelter and we want to finish in one hour. 10 kilometers. Here we go, 20 meters. It's going to do it. Oh, there we are, just there. OK, I think so yesterday we got exactly to that lab post. Today we're about, I'd say, five, six meters short. According to my measuring wheel, we've done 10,002 meters in one hour and three seconds. But we haven't come back quite to the place where we started. We're about, well, let's measure it. We are one, two, three, we are four meters short. So we can put that down to a margin of error. According to the stride wind, we have done a lot less distance. We've done 160 meters less distance. My heart rate is actually higher on this run. But I think that's due to the wind pushing into the wind a little bit. Who knows? My heart rate yesterday, average heart rate was 118 beats per minute. I think my average heart rate for this run is going to be at least 122, something like that, maybe even higher, as I was watching it coming down. Anyway, so we'll go back now to the studio and check out some data on the computer. OK, so let's have a little look at some of the data from this morning's run. And we'll have a little comparison with yesterday's run as well. It's quite lucky that my camera died on me yesterday because I've had a chance to measure the course twice with the measuring wheel. So both times with the measuring wheel, the first time I started at the lamppost and I ended at 10 K exactly on the lamppost and you'll have to trust me. I promise that's what happened. This time we started at the lamppost, went 5 K, came back and we measured just a little bit short of the lamppost, about six to eight meters or something short of the lamppost. Now I've had a look at the GPS track of yesterday's run and today's run. So for today's run, I've zoomed in on the satellite map of the GPS track of the course to where I turned around today. And you can see these beachhouses here and then just this gap here in the beachhouses, that's where I've turned around. So there was a red bin around about here. And remember, I said on the video, we've turned around just before the red bin and we've turned around that gap there. Now yesterday's run, I've zoomed in again to exactly the same place. But you can see here, there's the gap and we've turned around, what, three, four meters early. So why that's happened is probably because I have weaved around as I've been coming up the seafront and so the wheel has measured me moving. Obviously, you've got to go in a straight line. If you go in a straight line, you'll get five K in a straight line. If you weave about left, right, one side of the seafront, the other side of the seafront, avoiding people and dogs and traffic, whatever it might be, you're going to add distance. So so obviously that's what's happened here. So that's easily explained. But, you know, we were within six meters of 10 K with the measuring wheel on both days. So so that's that. Now today's run, we have a look at it. This is measured by the stride wind foot pod. And you can see we have a distance measurement of nine point eight four kilometers. Anyway, what we can do is we can use the stride GPS correction tool. It will look at the GPS track. So that should be pretty much exactly what my measuring wheel measured as well. That exactly where I ran and it will work out what it thinks I ran. So here we are, correct distance. This is exactly what we did when we did the track run video. Go and have a look at that video if you want to see me running around a 400 meter track for 10,000 meters. And here we are. We've got 10 kilometers points, 10.03 kilometers. So 10,030 meters. If we argue that the measuring tool is correct, that we've measured 10,000 meters with the measuring tool. So GPS has measured slightly over. Give or take 25, 30 meters or so it's measured long. But the stride wind has measured 160 meters short. So what we're saying here is that if I had run 10 kilometers on the track and stopped at 10 kilometers where the track marker is, we would have measured about nine point eight four, nine point eight three on the track, as it was, I ran that extra distance to measure 10 kilometers according to the stride wind. But if I've measured it according to the track, then we would have had the same result as we've got here, i.e. the stride wind being short by about 160 meters. What we also did, of course, was we measured the same run today with the old stride foot pod, the non wind version. And if you remember the track run, the old stride was 90 meters short of the 10K line. So it was 90 meters incorrect. If we look at today's run, I'm going to use Garmin Connect website here for this one. I had it on track running mode on the Phoenix 6S, which was on my right wrist, the white watch. And look, we've measured 10,130 meters. So a bit longer, actually, than on the track. The non stride wind or the non wind stride has measured an extra 130 meters, as opposed to the 90 meters that it was long when we did the track run. So that's interesting to note that we've had this kind of similar results. Really, the non wind stride is measuring long, longer than 10,000 meters. And the wind stride is measuring shorter than 10,000 meters. And we have good measurements on the track. We know the track is 25 times round the track that makes 10,000 meters of running. And we've measured a 10,000 meter course on the seat front with a measuring wheel. And we know we've got 10,000 meters. Give or take a few meters here or there within a margin of error. We know we've got a 10,000 meter course along the seafront. So we know that those stride foot pods essentially are measuring incorrectly. Now, not by much. This, I mean, this is less than 2 percent error. And Stride would argue that that's probably within an acceptable margin of error. Less than 2 percent, 10,000 meters. If you run an extra 130 meters, it's not really here and all there, is it? If you saw that again, like I said in the track video, if you saw that on your Strava feed, you'd probably just ignore that 130 meters extra. Or you you probably actually if you ran a 10 K race and you saw that it only measured 9.84, you were 160 meters short, then you might well, you might question that. Actually, you might not be too happy that it didn't measure the full 10 K and you'd be questioning the race organiser and say, why why is this race short when, in fact, it's not short? It's the stride that's measured incorrectly. OK, there we are. We can also look here at some other stats, if you like. Heart rate. I measured heart rate with the optical heart rate sensor on the Phoenix six on my right wrist and with a chest strap for the Phoenix six X on my left wrist. And here you can see pretty much identical or you can notice is that the purple line comes slightly before the blue line and the heart rate strap is slightly quicker at reacting than the wrist based heart rate. And you can see down here at the old stride on the Phoenix six S measuring with optical has measured around about 121 beats per minute and so has the stride wind with the chest strap. You know, give or take 120.63 so rounded up to 121 beats per minute. So it's the same, basically. Cadence is pretty much identical. And here you can notice the speed of the two foot pods. So the old stride average pace of 10.13 kilometres per hour and the stride wind 9.86 kilometres per hour. And you can see that here pretty much the whole way through. The old stride is measuring faster than the stride wind. We move further down, we look at distance. We can see the two runs diverging so that each run finishes the stride wind finishes behind the old stride at the end of the run there. Let's ignore elevation and let's go to developer fields. These are both the power meters. So this is the stride wind power meter and the old stride power meter. What's interesting here is they are very similar here. This is the first half of the run. So this is halfway through the run here. This is the first five K where there was no wind. Now they look almost identical, but if you look closely, you will see that the stride wind is slightly behind the old stride. So the power numbers are slightly greater for the old stride foot pod. So one seven seven to one seven five there. Look, or here we've got one seven six to one seven two or further along. We've got one eight one to one seven six. But then we move to the second half of the run and we notice that suddenly the stride wind picks up. And that's because we're getting a lot of benefit of extra power given to us by the stride winds air power feature. So the stride wind is adding extra power on to make up for the extra effort we're making to get through the headwind that I was running into on the way back. And that's turned into basically an exactly even power match for for both runs. If we just go to this page here, this is basically the same run. All these three Google spreadsheet entries are for the same run. The stride wind, the old stride and a corrected GPS. So we've got the one eight four, the one at ten point one three and the GPS correction at ten point zero three. But look at the power. The power is exactly the same. So this is the power for the stride wind one seventy seven. This is the average power for the old stride. This is normalized power. And this is heart rate one hundred and twenty one beats per minute. So the power for both both stride foot pods has evened itself out over the course of the run. And they've both ended up being the same. So there we are. So that is my analysis of the data for those for that run today. And just go and have a look at the track video as well. There is a track video in which I do pretty much exactly the same thing. Go for a 10,000 meter run on the track, measuring it with the stride wind and the old stride. Results are pretty similar. So that's it from me here at the film my run shed quarters. I hope you've enjoyed it. I hope you found something interesting from it. Take care and we'll see you for another film my run video. I promise I will stop doing stride videos soon. I promise I'm just collecting a lot of stride data at the moment. I apologize if you're getting bored of it. But if you like stride, if you like all this stuff about treadmill running and accuracy and distance measurements and power numbers, then there probably will be one or two more of these stride videos. If you're bored of them, then I apologize. I do have more marathon and ultra running point of view videos coming soon. Hopefully you'll find those of more interest. Take care. We'll see you again for another film my run. Bye bye.