It would be great to have the option to customize (or filter) reports the same way you can "filter" your activities. (ie activity type, event type, course, time period, distance, time and elevation gain) Some times you want to see your statistics since a specific date or time period of a specific activity. At one time this feature was included in the old version of Garmin Connect. Then, when the new version was released this function quit working on the old version. You can select an activity type or time period but then the other options disappear.
If this is to be used as a training tool then this needs to be fixed.