FAQ Index
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FAQ: Sync Activities from Other Sources like Garmin, Wahoo, Strava
Duplications of data from Strava & other source?
This can happen if Strava and another source both import the same workout but with slightly different files (for example different moving time or distance). Auto-matching may fail, so both entries stay visible.
Recommandation: Only keep downloads of activities from the original source. Disable the Strava download option if your activities always come from another source. You can also filter activity types from Strava if you have an activity type that is only synced from Strava.
Also note: Strava privacy circles can affect reported distance/time and increase mismatch cases.
Links:
- Matching activities with different distances?
- [SOLVED] Coros data overrides Strava data (Ans: Other sources will override Strava)
Duplicates of data from two sources (not Strava)?
Yes, duplicates can occur when two direct sources send the same workout (or after reconnect/reimport). Non-Strava source combinations are not always deduplicated automatically.
What helps:
- Keep one primary source per device/sport where possible.
- Disable duplicate import paths.
- Clean up existing duplicates on the activity list view by sorting after source or creation date once after changing source setup.
Links:
- Multiple duplicate workouts
- Duplicate Activities after Reconnecting Wahoo
- [SOLVED] Ride Double Up after setting up Zwift (Please Only Allow One Source)
- [SOLVED] Duplicate workouts virtual rides
Strava historical data is missing
As a non supporter, the historical download of data from Strava is limited. Though you can request the full history export from Strava.
Links:
Garmin historical data missing
Garmin limits historical fetches and so historical backfill can be incomplete or fail (for example duplicate/overlapping request issues). In that case, Intervals.icu may not receive all older workouts automatically.
What to do:
- Use full-history import (
Import All Garmin Data). - If specific workouts are still missing, export FIT files from Garmin Connect and upload them manually.
Links:
Why did my Strava or Garmin sync suddenly stop after I did not use Intervals.icu for a while?
What to do: Open Settings → Connections and use Download old data for the affected connection. If you are not a Supporter and have not used Intervals.icu for a while, the connection may have gone dormant. This is usually expected behavior, not a broken sync.
Representative solved threads:
- [SOLVED] Weeks of data missing
- [SOLVED] Strava integration stopped working
- [SOLVED] Runs stopped showing in the calendar (Ans: Strava Dormant.)
- [solved] Workouts from Garmin don‘t import (ans: dormant)
- [SOLVED] Strava not syncing since April (download old data)
“Download All Data” ZIP is too big or does not import
Do not upload the huge Garmin ZIP file directly. Use the download hyperlink from Garmin’s email.
Correct workflow:
- In Garmin’s email, right-click the download link and copy the hyperlink.
- Paste that URL into Intervals.icu
Import All Garmin Data.
Links:
- [SOLVED] ZIP file garmin too big
- [SOLVED] Problème importation historique Garmin
- Garmin data missing 5 week
Why did my activities are missing, after revoking Strava access?
Strava’s T&C does force to delete all data that were previously transfered. You can request your Data from Strava and Import the complete Data with the Email Link you get from Strava.
FAQ: FTP & Zone Settings
How to setup FTP History?
FTP in Intervals.icu is copied to each activity. If you change FTP today, old activities are not automatically rewritten.
Best practice:
- Open Activity List and show the FTP column.
- Set/correct FTP values for the relevant date ranges.
- If many activities are affected, use bulk edit on the activity list view (
Edit > Edit).
Links:
Why is my Heartrate clipped?
Usually this is caused by max HR / HR zone settings that are too low (or historically inconsistent).
Fix:
- Update max HR and HR zones.
- Apply the correct values to the relevant time period.
Links:
Why is my Power clipped?
Most often power clipping is caused by spike settings: values are detected as unrealistic spikes relative to current thresholds.
Fix:
- Set a realistic FTP (also check sport-specific FTP).
- Increase power spike threshold if genuine peaks are being cut.
- Re-analyze affected activities.
Links:
- FTP and Power Spikes
- [SOLVED] Power not showing correctly(Ans: Update Your FTP / increase the Spike % Threshold)
Why does eFTP look inconsistent, wrong, or not update the way I expect?
What to do: Treat eFTP as a suggestion, not an automatic truth. If the estimate looks wrong, do not accept it. Your previous FTP stays in place until you explicitly accept a new value.
Representative solved threads:
FAQ: API Access
Why do I get API access denied? (401 Unauthorized / 403 Access denied)
Most cases are authentication format issues.
Check these points:
- Username must be literally
API_KEY(NOT your actual key string and NOT your athlete ID). - Use the correct auth type from the API example (
Basic, notBearer). - Verify token string formatting (no extra spaces/characters).
- Verify athlete ID/path (
0for own account endpoints;i...ids where required).
Links:
Request for Oauth2 and/or Webhooks
If you develop an application and want to integrate via Oauth, then write David a private message according that post:
FAQ: Activity Data + Time Metrics
The reported Moving Time is not matching Strava, Garmin, TP, etc.
Moving Time is not always a fixed value in the file. Different platforms calculate it differently from pauses, velocity, and event data, so values can differ for the same activity.
If you want behavior closer to elapsed/recording time, enable Ignore velocity for that activity.
Links:
My Training Time is too low
This is common for indoor sessions, but can also happen for outdoor activities with poor GPS or velocity data. Intervals.icu can underestimate moving/training time when files contain long low-speed or zero-speed segments.
Fix for a finished activity:
- Enable
Ignore velocity(Actions/Settings).
Fix for future activities:
- Disable GPS for indoor sessions.
- Use trainer/speed sensor data instead of indoor GPS.
Links:
- Ignore velocity option for activities
- Wrong moving time on activity, right moving time on charts - #3 by MedTechCD
Why is my climbing or elevation way too high, too low, or different from Garmin or Strava?
What to do: Check Actions → Settings → Use elevation correction on the activity. If your device already has good barometric elevation, turning elevation correction on can make the climbing look wrong because Intervals recalculates from map elevation instead of your device data. Turn it off, then reprocess the activity.
Representative solved threads:
- [SOLVED] "Climbing" number is massively overstated
- [SOLVED] Climbing (total elevation gain) inaccuracies (Ans: Check "elevtion correction")
- [Solved] Having elevation/climbing misread data on runs
- [SOLVED] Error in altitude/climbing on running activities
- [Solved] Altitude correction is kind of weird
Why are my intervals not detected, shifted, or obviously wrong?
Intervals.icu tries to detect intervals regardless of your laps. If you want to use your laps try Actions → Use Laps so Intervals.icu respects the lap markers from your device. You can enable that option per sports category on the settings page, to use Laps by default.
Why is my activity type wrong, such as table tennis showing as running or SUP showing as walking?
What to do: Assume the problem starts in the source FIT file, not in Intervals.icu. If the device or upstream service wrote the wrong sport type, Intervals can only classify what it receives.
Representative solved threads:
- [SOLVED] Tabletennis gets recognized as Running (Ans: Amazfit not writing the FIT file properly)
- [SOLVED] SUP activities categorized as WALKs when imported from Polar Flow
Why does my fitness, load, or intensity look wrong even though I am training normally?
What to do: Check your FTP , resting HR , HR max / threshold settings , and which load setting you are using for each sport. Many solved threads came down to one of these settings being wrong, stale, or inconsistent between sports. If power is unreliable for that sport, switch the load calculation to HR or Pace and update workouts afterward.
Representative solved threads:
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FAQ: Workouts
How to start writing workouts?
Read the linked article or watch the linked video to „learn the basics“:
My Workout is not showing the skyline chart or is not parsed correctly.
First check, if you set your intensity settings on the settings page for that activity type (Pace Zones for Pace Targets, Power Zones, for Power Targets, HR Zones for HR Targets).
Check the Quick Guide for Guidance how to write steps, and if there are any errors: