Running, but supposedly fitness declining
Running, but supposedly fitness declining
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UTH

Original Poster:

11,478 posts

200 months

Friday 5th December 2025
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In the last couple of months I've finally kicked my arse into gear to start getting fit again.
From the heady heights of 2016-2018 when I was training to climb some big mountains, I was running up to 10km 3 or 4 times a week, a couple of half marathons etc.
I've always used the Jabra headphone and app to track everything. Back then my fitness got up to 'Excellent' at 58ml/kg/min, as per below:




Having done very little in terms of fitness/running since 2018, I started again mid October, quite quickly getting from a painful 1km on the treadmill to now doing 5km each time I go to the gym. But the thing that's somewhat annoying me is that the last two or three runs I've done in the last week, the app seems to be telling me my fitness is declining:



I guess I'm wondering how much attention I should be paying to the app? Given I was struggling to do more than 1km 6 weeks ago to now doing 5km each time, my fitness must be getting a lot better. But the 50ml/kg/min from my run yesterday is the same 50 as my first run in 7 years back in October!

Brainpox

4,279 posts

173 months

Friday 5th December 2025
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If you’re getting fitter why would you listen to the app? Clearly it’s bullst

UTH

Original Poster:

11,478 posts

200 months

Friday 5th December 2025
quotequote all
Brainpox said:
If you re getting fitter why would you listen to the app? Clearly it s bullst
Well back when I was training all those years ago I found it very motivating to watch that number creep up, I think I started at "Good" then up to "Very Good" then "Excellent". I hate running really, so anything to keep me motivated was a good thing.

fiatpower

3,559 posts

193 months

Friday 5th December 2025
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I've never really paid attention to the V02 max as it's just off my watch rather than properly measured. My peak (measured with a watch) was 60 something when I was fairly fit (running halves regularly, 21 min 5k etc). I then swapped my watch and it declined over the next few years even though I was running ultra marathons and was at that point doing a 19 min 5k.

If you want to use V02 as a benchmark go and get it measured properly. Personally i'd do a parkrun or something similar to get a 5K time and use that as your benchmark to fitness.

joshcowin

7,228 posts

198 months

Friday 5th December 2025
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The downside of tracking and apps etc is this!! You know you are getting fitter so just ignore the app.

UTH

Original Poster:

11,478 posts

200 months

Friday 5th December 2025
quotequote all
fiatpower said:
I've never really paid attention to the V02 max as it's just off my watch rather than properly measured. My peak (measured with a watch) was 60 something when I was fairly fit (running halves regularly, 21 min 5k etc). I then swapped my watch and it declined over the next few years even though I was running ultra marathons and was at that point doing a 19 min 5k.

If you want to use V02 as a benchmark go and get it measured properly. Personally i'd do a parkrun or something similar to get a 5K time and use that as your benchmark to fitness.
Yeah I was around the 22 mins mark for 5km at my best, currently about 26 mins so I guess that tells me all I need to know.

MesoForm

9,682 posts

297 months

Friday 5th December 2025
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joshcowin said:
The downside of tracking and apps etc is this!! You know you are getting fitter so just ignore the app.
That or the OP has a virus and is actually not as fit as he was a couple of weeks ago as his heart is working harder for the same running effort.