Strava
Used by 4 peoplestrava.com ↗

“When I cycle I sometimes use Strava to log my speed and distance.”
Fritz van Deventer Interview, Developer, musician (Cheeses of Mexico) · via Uses This 
“With cycling, the only software I really use is Strava.”
Bryan McClaran Interview, Chef de cuisine (Uptown Management Group) · via Uses This 
“Strava is a free smartphone app and website for tracking your running and biking.”
Matt Cutts Interview, Head of Google's webspam team · via Uses This