Fitness tracker: So I got back to running today... - Couch to 5K

Couch to 5K

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Fitness tracker

ChrisWhatmough
ChrisWhatmough

So I got back to running today and took my Garmin forerunner out.

Now I run on treadmill. At the end of my run my distance was recorded as 3.8k.

According to my Garmin my distance was 4.6k.

Big difference if I’m aiming for a 5k.

Can anyone shed some light on which I should go off?

11 Replies
oldestnewest
Hidden
Hidden

The treadmill is going to be more accurate. The Garmin is relying on GPS which has a margin of error. 👍

Saying this, I've just analyzed this morning's run in an app called "Footpath" which allows you to trace your exact route (including any footpaths and things). It said my run length was 2.14 km, Garmin gave it as 2.04 km. So the Garmin underestimated on this occasion.

Now I'm not entirely sure what to say about your question! 😂

John_W
John_WAmbassador in reply to Hidden

GPS ??? On a treadmill ??? How does that work Hidden ?

Hidden
Hidden in reply to John_W

The watch is using GPS not the treadmill?

John_W
John_WAmbassador in reply to Hidden

Nope. Think about it . What does GPS do? What does GPS stand for?

Hidden
Hidden in reply to John_W

LOL, I'm not 100% sure but it won't work indoors if it can't get the satellite signal. Am I right?

EDIT: And yet I've just tried it sitting in my living room. It took a moment more but I still got the GPS Ready notice.

EDIT2: And then I just realised. You're not moving position on a treadmill. Oh dear, now I feel like a total idiot! 🤣🤣🤣🤣

John_W
John_WAmbassador in reply to Hidden

GPS = Global Positioning System - a satellite system that calculates your position on the Earth.

If you're running on a treadmill - ANY treadmill - then your position on the Earth is going to change is it ? You're in the same spot for the entire duration of the run.

John_W
John_WAmbassador in reply to Hidden

YAY! See my reply to Chris below as to how these watches measure distance on a treadmill :-)

damienair
damienairGraduate

I don’t know how it works indoors but outdoor running the Garmin GPS watches are very accurate. I’d go off the data on the treadmill.

Damien

John_W
John_WAmbassador

Hi Chris,

Assuming you have the GPS switched off (!), the distance your Garmin measures on a treadmill is estimated by using the in-built accelerometer which monitors the movement of your arms. It's from that that it estimates your steps-per-minute and calculates your stride length and therefore your distance.

The treadmill's recorded distance will be a LOT more accurate than the watches estimation.

UnfitNoMore
UnfitNoMoreAdministrator

My money is on the treadmill being more accurate, but neither being 100%.

2718281
2718281Graduate

When you finish a treadmill run (you have to select this sport mode in your Garmin) instead of saving, you can scroll down and you find a calibrate and save option. You can adjust your Garmin slightly to match the pace in the treadmill and it will be better for the next run (but it will never be too accurate, as explained before, in the treadmill the calculation of your watch is based on your wrist movement and your height, and assumes and average relationship of those parameters and speed...)

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