"Yard sprints" refers to a type of exercise in which someone runs as fast as they can for a short distance, typically the length of a yard. Full definition
Adding 5 - 50 yard sprint sessions into the weekly training routine is also a great way to boost top speed. (verywellfit.com)
Ian Wright was incapable of shutting up during the games, we hated being a goal down and then seeing him make a 40 yard sprint at the Ref on the 20 minute mark, then again on the 30 min mark and get a yellow, then the 40 min mark while still a goal down, then every twice more in the second half, then he'll score an equaliser. (justarsenal.com)
For example, instead of running for an hour straight, a person might run 20 - yard sprints for, say, 15 minutes with small rest periods in between. (medicaldaily.com)