How to track pool swim laps instead of lengths on Apple Watch?

When I use my apple watch to track a pool swim, after setting the length of the pool, it tracks the number of lengths that I swim. A length is swimming from one end of the the pool to the opposite side. A lap is going there and back. The watch calls a length a lap. Is there a way to adjust this, or do I just do the math myself?

[Re-Titled by Moderator]