FACT: really long sessions in the pool are mind-bendingly, soul-crushingly, will-someone-please-do-me-a-kindness-and-shoot-me-now boring. Actually most of my pool swims incorporate lots of intervals (which is sporty-speak for stopping then starting again just when you've reached the optimal moment of feeling utterly ******d), but once a week I need to get used to just swimming steadily for. a. long. time.