Corrupted fit file

This will work - B4PB3958-fixed.fit

Download then import into Garmin Connect using the import data page

Repaired using Fit File Repair Tool.

Some tips to help minimize the occurrence of corrupt fit files:

• Backup, then remove the files in the \GARMIN\ACTIVITY folder on the device’s file system using these directions: Removing Recorded Activities on a Garmin Fitness Device If you delete the files in your activity folder with a Mac computer, then empty the trash folder before you unplug your device from the computer.
• Try to avoid excessive button presses during your activity.
• Regularly check for firmware updates using Garmin Express
• If issues with corrupt files persist, contact Garmin Support.