Free! Episode 5: Trial in Open Water!

info: MAL/wiki/AniDB

 Believing that the added pressure will help the Swim Club in their training, Gō continues to make her countdown calender for the upcoming prefectural tournament. Meanwhile, as the guys decide on which events they will each participate in at the tournament, Gō discovers a decades old training regiment of the past Iwatobi Swim Club and excitedly proposes that they use it and venture to an island for a summer training camp...

 In episode 5 guys go to an island to train and build more stamina. We also learn more about Makoto's past and scarring experience with the ocean. Download link or watch here.