Is Garmin planing to improve the site? There are couple features that can enhance the site. It will be nice if some of them can be incorporated. Sorry I don't know if there is a post where this is reviewed but I have not seeing any new features or improvements on the application in a long time.
1) Use space on the screen more effectively. For example on a run when you scroll to the bottom you have 3 columns Heart Rate, Elevation, and Running Dynamics. The you need to scroll down more to see the fourth column Timing. Timing will be nice to have it with the first 3 columns to avoid unnecessary scrolling and have all the information side by side
2) Training Zones - The information provided under the Heart Rate column for training zones is poor. It will be nice to see how much time spend on each training zone. Have the ability to name the training zones. Have the ability to show the training zones on the heart rate graph
3) Crop Exercises - This happens to everybody that we forgot to stop or start the clock on time, so it will be nice to have the capability to remove couple measurements at the beginning or end of the exercise within Garmin connect and not have to depend on other sites or tools and then go through the process of exporting and importing to have it done. Or on a multi sport exercise, you want to remove one of them.
4) Ability to scale the graphs. There are many time where the graphs look very flat when in reality is not, having the ability to adjust the scale will help a lot
5) Reports - Have the ability to create reports based on a custom period of time. For example I want to see a particular report for up to today this year and I can't as I'm limited to pre-set periods. Have the ability to create custom reports at the end all the information is there but can't get it.
6) Export - Ability to export the detail data for an exercise to a CSV file instead to a FIT file that only some applications can open it for further process
7) Device Settings - Some important information which is already set on the profile settings or personal information like age age, max heart rate, gender, etc. is asked again under Device Settings so there is duplicate information and could be out of sync.