Got your point. Let’s see if someone knows how this calculation works and some views on point 2.
Thanks for your input buddy.
Intervals.icu needs duration to calculate training load. So if you specify a step using distance and HR it assumes a pace in the middle of Z2 to calculate the duration. The sport settings for the currently selected athlete are used.
If you also specify pace then that pace is used to calculate duration even if the workout is done by HR. Example:
- 5km Z2 HR Z3 Pace
Hope that helps.
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ok got it.
How about the Question 2?
Share a screenshot of the activity graph, eg. like this example.
It will help to see your lap setup compared to the list view.
To fix it manually, youcan manually change the interval in two ways:
-
Drag the right side of the first interval to the right, at the end of 5km;
-
Click on the first interval, and change the duration.
Why it happens?
I’m not 100% sure of the exact reason. The algorithm does like smooth intervals, and power is easier than HR and pace. There are a few topics where David has answered the queries:.
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Thanks Gerald. So i think i need to fix them manually. 
Does your original FIT file has laps recorded?
It’s interesting why instead of 1km splits, there is 1.6km splits (incidently 1mile = 1.6km)
If you’re using Intervals.icu built in LAPS detection, maybe that’s why it’s using 1.6km. Not entirely sure, you could change it to also ask intervals to “always use laps”
Yes the setting is in miles and I think that is the reason it is splitting them in 1.6 km instead of 1 km.
I think yes original activity on garmin shows data well.
How to use “always use laps” setting? where can I find that?
For this activity only:
within activity:
Then analyse: → Keep All Laps
Then within Settings: This will apply to ALL ativities moving forward.
Thanks. I will check this.
thanks Gerald.
I think it’s not intervalls.icu issue. Seems Garmin has put laps but it has segregated that into each mile mark and there itself it is coming likewise.
So I need to check how to fx on Garmin now. 
Sorry for the confusion here.
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Just check if your device has auto lap activated in the settings.
If I remember correctly, it is default on when creating a new profile.
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I suspect that too. was reading over Google for the same and found this on the same lines that you mentioned
Will try to switch that off. Thanks again mate. 
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hang on. what are you looking for?
Do you want autoLaps in Garmin? Or you do not want it? If you do not want it, then yes, you can turn it off.
Or you want autolaps in Garmin to be based on every 1km instead of 1.6km (1mile). If this is the case, then you need to change the auto-lap to use 1km instad of 1mile.
Regardless of Garmin settings, if you want want Intervals.icu to automatically detect intervals, Intervals.icu will detect it based on power/hr/pace changes. If you have say 4km ran at constant pace, I think it’s likely intervls.icu will only show this as 1 lap (of 4km). Interval.icu does not use any of the “laps” data that is written by the watch. It calculates the laps using the raw data.
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Just to be clear: Intervals does use that lap data if you choose ‘Use Laps’.
But Intervals disregards that data if it auto-detects intervals from Power/HR/Pace.
yeah… already established that in 2 responses above from both me and gerald
So yes what I simply want is I want my actual workout blocks to be captured and look similar exactly as they look on planned workouts. So I think fixing the Garmin will resolve this one. will try this. for example - if I plan to run 5km at whatever pace, hr, or power, it should still show me a 5km block rather than breaking that into pieces irrespective of whether it is a consistent pace or not because pace may vary in between for some. It makes analysis easier. 