Playing catch; throwing and catching a ball between two or more people, often used as a baseball warm-up.
休日は公園で友達とキャッチボールをした。
On my day off I played catch with a friend in the park.
試合前に投手とキャッチボールをして肩をほぐす。
Before the game the pitcher plays catch to loosen up his shoulder.
小学生の子供にキャッチボールを教えるのは簡単な運動になる。
Teaching elementary school children to play catch is a simple exercise.