The Iwatobi Swim Club needs one more member before it can participate in relays.  Nagisa has set his sights on his classmate Rei, who is a member of the track team.  Despite Rei's refusal to join, but Nagisa appears intent on recruiting Rei into the swim club.
Since it's a joint practice,
Da es ein gemeinsames Training ist,
comme c’est 
un entraînement commun,
Visto che si tratta di un
 allenamento in collaborazione,
Como é um treino coletivo,
Раз это совместная тренировка,