As far as I'm aware there are 800m and 1500m events for freestyle in the pool but for other strokes such as breaststroke, backstroke and butterfly it seems to be capped at 200m. Why is this the case for the other strokes?
Thoughts:
I'm aware that butterfly is a taxing stroke to sustain, but one can imagine that athletes would have the capacity to train for a length of 400m. Assuming this is the case, would it be possible to push this to 800m?