Calendar to plan Activities or workouts in advance
It would be great to be able to plan activities on the Strava Calendar. So we could write down the activities for the Month or week in advance and then marked then as done (and edit them before mark as done if changes). We can already do this more or less by using a future date in the activity details. But in the case of riding for example you are not able to upload a track after the creation of the activity.
As a added value, a great functionality would be also that an user (in the role of trainer we could say) could write down the activities plan in the calendar of a friend or trainee.