Spend a little time on Strava and you’re bound to encounter some quirky behavior endemic to fellow ride-trackers. There’s that esoteric ride titler, or the guy who documents his every physical movement, or that friend who mysteriously squeezes in 400 miles a week without losing her job. (Seriously, how does she do it??) Masters road racer—and self-professed Strava addict—Ken Murphy started noticing certain archetypes popping up on the app and was inspired to create something of an illustrated field guide under the Instagram handle “A Quiet Bird." Here’s his good-natured guide to identifying Strava’s most notorious characters. Chances are, you’ll relate—or find a few friends in here.