I recently switched from Band 2 and Garmin Connect custom strength workouts are missing 90% of Band 2 / Microsoft Health's cooldown exercises (various stretches, rollers, etc). Please make an account on their site and copy the full list, or better yet partner with Health so people can use it to make workouts because it is *miles* ahead of Garmin's solution.
I've tried to fit all my unknown exercises into the notes field but it turned out that one exercise can only show a small amount of each note, so I'll have to get around it by making a dozen Sleeper Stretches in a row with notes that tell me what I actually need to do.