Hi there,
Someone may have already requested this but i think it would be great to have a "Bleep test" app for the garmin fenix where it bleeps through the stages and your watch tells you which level you are at on the screen, a good example of the test can be found here - https://www.youtube.com/watch?v=e0U_yQITBks .
You would have to mark out the 20m yourself but it would be good to see what level you are at and you just hit the stop button when you miss the line and it saves your progress.
Just an idea.
Cheers.
Paul.