Often, activities are related to races which have their own external websites.
You want to have that ability to add links that are clickable, in your activity's description field(which might be a race's result website). If you paste a link in the description field today, it is not clickable from the activity feed page. It requires going into the activity with an additional click and only then is it possible to open the link. Even then, this link does NOT work even if you navigate into the activity on Android.
Another more focused solution is if the run/ride time is of type "race" there will be an additional field added for a link of that event, which when added can be clickable.
Bonus, we might want to consider activities' comments also having the ability to add clickable links.