What is meant by “Short Course” and “Long Course”?
These terms generally refer to the length of a pool. Short Course is a 25-yard (or meter) pool and Long Course is a 50-meter pool. The names are also used for the two “seasons” in USA Swimming. September to March is the Short Course season when meets are held in (indoor) 25-yard pools. April to August is the Long Course season as meets are held in 50-meter pools – some indoors, some outdoors. Some 50-meter pools can be configured as either long course or short course by running lane ropes length-wise or width-wise or by inserting a bulkhead in the middle of the pool.