Combine Nordic Skiing and Cross Country Skiing Activities
It is confusing to have two different activity types (cross country ski and nordic ski) for the same thing . This leads to two different leader-boards for the same activities. These two activity types need to be combined.
Also as others have suggested, it would be useful to have skating and classic as seperate activity types. As these really are two different activities. You could have "Nordic Ski -Classic", and "Nordic Ski-Skate" as the options.