sprint walker
someone who while running any amount of distance, will sprint at full speed for some time, then begin to walk for some more, and repeat the process until they have gone the full distance. They are undeniably some of the worst and most annoying people.
*while running a two mile race*
Sarah: "Ugh, look at Tristan, he's a sprint walker."
Milly: "Ew, I can't stand those people."
Sarah: "Ugh, look at Tristan, he's a sprint walker."
Milly: "Ew, I can't stand those people."