We don't currently have any options to enter specific exercise data, though we may be able to look into something like this as we further develop things over time.

For the time being, if you need to accommodate varying activity levels in your meal plans, you can always create multiple sets of Nutrition Targets (Training Day and Rest Day, for example) that you can assign to different days of the week in the Meal Layout. You can see more about this here: Setting up a carb cycling meal plan