the lane on a swim team in which the talented but lazy swimmers go. not quite hard core enough for lane 1 or hard working enough for lane 2, but better than lanes 4-6.
could go to state if they did their full sets, but they're too laid back. lane three is a good time typically full of chill people and one person who swims on the wrong side of the lane or attempts to wound others.
Coach: You know, you could go to state.
Swimmer: Nah, that's okay. I'm too used to lane 3.