tempo run
n.— «By the time you read this, I’ll have finished week six: still four days of running, but the mileage has jumped to 22. That includes a nine-mile “long run” on one day, plus what’s called a six-mile “tempo run,” including four miles at an 8:30 pace, on another.» —“The run-up to a half-marathon” by Leslie Gardia Dallas Morning News (Texas) Oct. 3, 2006. (source: Double-Tongued Dictionary)