Because an Olympic-size swimming pool is 50 metres long, this race consisted of four lengths of the pool.
bɪkˈʌz ɐn əlˈɪmpɪksˈaɪz swˈɪmɪŋ pˈuːl ɪz fˈɪfti mˈiːɾɚz lˈɔŋ, ðɪs ɹˈeɪs kənsˈɪstᵻd ʌv fˈoːɹ lˈɛŋθs ʌvðə pˈuːl.