Comment by hjk05

They exist and they are very annoying compared to regular old 50m lanes. You end up having to constantly overcompensate to one side (obviously) but also you suddenly have to either burn in a constant bias to your technique (bad) or be constantly aware of the boundaries, which ruins the normal flow of pool swimming. They are fun for families and kids who only ever do one or a half round, but if you like swimming just stick to traditional pools.