noun
voluntary practice; self-directed training
Abbreviation of 自主練習. Common in sports, music, and club activities for extra practice done on one's own initiative, outside of regular sessions.
See also: 自主練習
毎朝、自主練で素振りをしている。
Every morning, I do practice swings as voluntary training.
試合前は自主練の時間が増える。
Before a match, time for self-directed practice increases.