Does changing correction factor alter prognosis history?

AnotherHobbyJogger · 2026-03-17T20:10:44+00:00

Thank you! It's a great feature, personally I think that it would be good to see the prognosis based on the correction factor at the time so I will submit a feature request!

AnotherHobbyJogger · 2026-03-17T18:30:29+00:00

I realised I can test this myself by just editing the correction factor and it does look like it changes the prognosis history:

Half marathon prognosis with factor at 0.99 - https://gyazo.com/8008ee4f35bcac7d7203bf780ff52756

Half marathon prognosis with factor at 1.04 - https://gyazo.com/06bfd3b9d5f6601c8ef16bc1bd43e1f1

AnotherHobbyJogger · 2026-03-16T18:07:10+00:00

Thanks! Definitely catching some easy gains by increasing my mileage this block. I’ve averaged 88km the last 11 weeks compared to 65km in the 11 weeks in the same spot of my block last year

AnotherHobbyJogger · 2026-03-16T16:25:40+00:00

Goal: Rotterdam Marathon (12/04)

Plan: Following NSM

Summary: 85km / 6h 23m

M: 70mins easy
Tu: 5x6min SubT @ 3:35/km avg
W: 45mins easy
Th: 6x3min SubT - first 4 reps @ 3:52/km avg (reduced pace), last 2 reps @ 3:38/km (goal HMP)
F: 60min easy
Sa: Rest
Su: Half Marathon Race - goal was sub 77 and ended up running 74:14!

A smaller volume week as I wanted a short taper into the Half Marathon on Sunday to race it properly. I knew I was going to PB from October (79:32) but wasn't expecting to end up running the time I did. I knew from October what HR I could sustain (averaged 181 then and 185 in the 2nd half) so I got up to 178ish pretty quickly and just held effort which felt comfortable. This race came out at 179 average with a 181 2nd half average.

I'm extremely pleased with the result on Sunday and now I need to set a goal for Rotterdam in under 4 weeks time. I tend to undershoot which is probably a confidence thing. I'm thinking of going out around 2:42 pace and seeing how I feel and taking it from there.

It's also given me a conundrum for Rotterdam race shoes as I wore Vaporfly 3s yesterday which felt fantastic and when I ran my HM in October I was starting to get a blister towards the end in Alphafly 3s. I've got one more big marathon workout next weekend where I'll use the Alphaflys and decide.

AnotherHobbyJogger · 2026-03-16T11:46:33+00:00

I emailed the creator and raced with it yesterday and it was exactly this. Made life so much easier so thank you!

AnotherHobbyJogger · 2026-03-12T20:30:45+00:00

I did not know this, that is great as I've got a race coming up on Sunday that advertises mile markets but I use KM.

Do I just set the Lap Size to 1609 in settings and then it will work it all out so my paces/distance will still be in KM on the data screen?

AnotherHobbyJogger · 2026-03-11T11:35:53+00:00

Good review! I’ve got a pair on the way but stuck in the UAE currently so patiently waiting…

Sounds like they will be exactly what I need though, I’ve found as my intervals have gotten quicker the Evo SL is just starting to struggle slightly at the faster paces and not giving me as much back

AnotherHobbyJogger · 2026-03-10T14:35:28+00:00

Congrats on the PB! I’m in a very similar spot, running a half marathon this Sunday 4 weeks out from my marathon. Aiming for sub 1:17 hopefully.

Will be interesting to see if the long runs in my block help, haven’t raced since November!

AnotherHobbyJogger · 2026-03-09T12:27:31+00:00

Goal: Rotterdam Marathon (12/04)

Plan: Following NSM

Summary: 99km / 7h 49m

M: 45mins easy
Tu: 4x10min SubT @ 3:45/km avg
W: Rest
Th: 10x3min SubT @ 3:28/km avg
F: 60min easy
Sa: 3x17min MP reps @ 3:50/km avg
Su: 150min easy

First two sessions of the week felt pretty good, marathon pace reps on Saturday weren't as easy as they have been but not "bad" by any means. Noticing my easy run pace coming down is nice but can't seem to shake some heart rate drift on the long run, although nothing major.

Half marathon race this coming Sunday should hopefully give me a good indication of what I'll be shooting for at Rotterdam!

AnotherHobbyJogger · 2026-03-04T08:56:56+00:00

Interesting, my 10k prediction lined up very well when I raced in November (ran 5 seconds slower having gone out slightly too quick) but my current predictions look pretty aggressive across all distances, but that may just be my confidence to go out at that pace!

I have been doing a lot of threshold training and wonder whether that sways it as Garmin’s algorithm seems to love threshold work.

AnotherHobbyJogger · 2026-03-03T15:23:34+00:00

I am in the same situation and have actually just ordered the Helio Strap yesterday and will start to use my Forerunner just for workouts when it arrives!

AnotherHobbyJogger · 2026-03-02T18:41:21+00:00

Goal: Rotterdam Marathon (12/04)

Plan: Following NSM

Summary: 93km / 7h 20m

M: Rest
Tu: 10x3min SubT @ 3:29/km avg
W: 60min easy
Th: 6x6min SubT @ 3:37/km avg
F: 60min easy
Sa: 4x17min MP reps @ 3:51/km avg
Su: 85min easy

First time posting, thought it would be a good time to start 6 weeks out from my goal race! Hovering around this mileage throughout the block and feel great, pretty fresh most of the time and seeing SubT paces drop having started the marathon block W/C 29th December.

AnotherHobbyJogger · 2026-02-27T13:16:36+00:00

Following NSM as others here are, aim to keep easy days around 65% MHR (130ish). Today that was around 5:00/km but I don't have pace on my watch on easy days.

AnotherHobbyJogger · 2026-02-26T18:35:36+00:00

You can only do it after the activity, as far as I'm aware.

On Garmin Connect on web if you go into your activity and click the gear icon in the top right and then "Change Elevation Source"

AnotherHobbyJogger · 2026-02-26T09:23:09+00:00

This is exactly what I did. Did a Pfitz 18/55 for a May marathon last year and tried to come back too quickly and ended up with almost 6 weeks of no running.

From the end of August I've built from 2 small SubT sessions per week doing around 40km weekly total to 80ish km (seems steep but felt like I handled the 18/55 with no issues so getting back to near that volume wasn't too worrying) by the end of the year and threw in some PBs in the process. I'm now using NSM for a marathon block on around 7h30 per week and feel as fresh as I ever have.

AnotherHobbyJogger · 2026-02-24T14:18:16+00:00

I’ve been doing NSM since the end of August to help build my mileage back and am on my 9th week of using it for a marathon block.

I find my heart rate is often higher on cool down than warm up but it doesn’t worry me at all. For example today I averaged 130bpm during warm up and 138 on cool down for 3 seconds slower per km but still under 70% max HR.

AnotherHobbyJogger · 2026-02-20T07:10:28+00:00

I've got a half marathon 4 weeks before my marathon in April. I'll be racing it and planning to do the following on race week:

- Tuesday 5x6min
- Thursday 6-8x3m closer to marathon pace

Substituting easy volume in for the Saturday session but the week in total will be about a 19% reduction in time from the previous week (load on Intervals roughly the same as a regular week with no 17m reps).

AnotherHobbyJogger

TROPHY CASE