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FIT File Generator: add a run you forgot to record (Garmin → REN)

REN support

Battery died during a run? Forgot to start your watch? You can still get that session into REN by creating a FIT file and uploading it to Garmin Connect. Once it’s in Garmin Connect (and your REN ↔ Garmin connection is active), it will sync to REN automatically. (runwithren.com)

When to use this

Use the FIT File Generator if you want to log a run that didn’t get recorded on your device (or didn’t produce an uploadable file), but you still know the key details like duration and distance.

How it works

  1. Open the FIT File Generator on the REN website. (runwithren.com)
  2. Fill in your workout details:
    • Run type: Outdoor Run or Indoor Run (Treadmill)
    • Date & time
    • Duration (max 100 minutes)
    • Distance (km)
    • Average heart rate (optional)
    • REN calculates your average pace automatically
  3. Click Generate & Download FIT File. (runwithren.com)
  4. Upload the FIT file to Garmin Connect (web):
    • Sign in to Garmin Connect
    • Go to Import Data
    • Choose the FIT file and import it (Garmin Support)
  5. Make sure your REN ↔ Garmin Connect connection is active.
  6. After the activity appears in Garmin Connect, it should sync to REN automatically. (runwithren.com)

Notes and limitations

  • This tool is designed for syncing to REN via Garmin Connect, since the FIT file is uploaded there first. 
  • The generator uses the inputs you provide (distance/time, optional average HR) to create a clean activity file—accuracy depends on what you enter.

Troubleshooting

The upload worked in Garmin Connect, but I don’t see it in REN

  • Confirm your REN ↔ Garmin connection is active (disconnect/reconnect if needed).
  • Give it a few minutes, then fully close and reopen REN.
  • Make sure the activity shows correctly in Garmin Connect first (if it’s not there, REN can’t import it). (Garmin Support)

Garmin Connect won’t let me upload the FIT file

  • Make sure you’re using Garmin Connect Web and uploading via Import Data. (Garmin Support)
  • Check that the run duration is 100 minutes or less (the generator limit).

Indoor vs outdoor—what should I pick?

  • Choose Indoor Run (Treadmill) for treadmill runs.
  • Choose Outdoor Run for outside runs.

    runwithren.com
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