retrieving balls; acting as ball boy
The activity of picking up balls during practice, often assigned to junior members or as a warm-up task.
During tennis club practice, first-year students often do ball retrieval.
ball boy; player assigned to retrieve balls
A person, especially a junior member, whose role is to pick up balls during practice or a match.
He can't play in matches yet, so he works as a ball boy.
Compound of 球 (ball) and 拾い (picking up), from 拾う (to pick up).