The idea came when thinking about where I’ve recorded Strava runs and wanting to see that on a map just like you can use stats and hearts on google maps to tag places you’ve been and zoom out on the map and see all the places. 
this would be a super cool feature to have for our activities/runs where you can have a map as a base layer and then in the activities layer you can checkbox “all activities” or specific like run/swim and this would populate the map with our gps route. 
This can have also like a heat map sort of aspect to it to show with color the most common places you have activities recorded. 
1-2 years of Strava premium for this awesome unique idea would be appreciated (: