You get to this screen from the marathon edit view.
You are presented with a list of dates with the training activity for the date in question. If today's date is within the dates in the plan then a button 'Today' is presented which will position the list to today's date.
The icon on the left has 4 possible values to indicate the status of the training activity.
A question mark is for a date in the past without a status.
A check mark is for a date in the past which has been completed.
A red cross is for a date in the past which has been skipped.
An empty box is for a future date.
The different icons are displayed in a sequence as you tap a row: Question Mark, Check Mark, Red Cross back to Question Mark.
You cannot update the status on a future date
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