Have you every wanted to reminisce about old runs? Have you ever wanted to show that multiple activities were linked together? or Tell people about your progress from one workout/route to the next. Well I propose there be a feature added to link activities. It would similar to adding media. You would press a plus button on the edit activity page which would take you to your activity list you would then select the activity or activities that you would like to link to this activity. Then when looking at the activity It would show the other activities title in the description with the ability for users to click on it.