Theoretically optimal, professor, but in practice suffers from
and just slow mother fuckers. O I'm sorry did I hit your feet with my hands? I wasn't sure if you were swimming or if you were drowning and needed assistance.
And urine. Schools bring kids to the pool by the busload. The math does itself. Uhhh, little pishers.
So I row. (The machine, not in a lake with the STROKE guy or the BDB variation.)
Or those old bestest friends, who talk a lot during 'swimming' in slow motion. Then one of them says something new, and the other ones makes a full stop. The first makes a full stop too, and they are just treading water and having an animated conversation right there, in the middle of the pool, causing a traffic jam. Of course some other gerontosauruses have to stop too, to see what is going on and mingle in the conversation.
And there are those senile carcasses who think those 50m lanes, or even the 25m lanes, are too long, and decide to swim from side to side, across all 8 lanes.
Still, I love swimming. Only not on senior citizen days...
Those children have their swimming lessons in a different pool.