.Fit file no PUID

[hummusprof]

Not currently identified on pronom, looking for some more information that could be pulled for these file types.
Format Name: Flexile and Interoperable Data Transfer file
Version Number: Unsure
PUID: Not existing
Extension: .fit
Description: A file created by garmin devices that tracks disticnt excercise events. Includes gps and other sensor data including heart rate.
Format Type: GIS?
Mime: application/octet-stream
Vendor: Garmin

[gleporeNARA]

I worked on this format last week. See attached for sample files, signature, and further information. The samples are from my own Garmin. This format has been submitted to PRONOM, however, a bit more research could be done on the history of the format. I was unable to find a format specification, probably because it is proprietary.

fit.zip

[gleporeNARA]

Here is an additional Garmin format, .gmn. Supported on different watches and GPS units.
gmn.zip