I did a swim today (my first this year), got to the pool early and was the first one in. My plan was to do an easy 1000m, not worry about time, just put in some time and get my strokes in. I was doing sets of 50m with 15 seconds break in between.
The first 200m felt fine. Hard work, but not too bad. When I hit 500m I knew that I wasn't going to be able to do the full 1000m. My stomach was starting to turn and I knew that fighting through just wasn't worth it at this point. So I decided to stop after 800m. I was pretty beat.
What really bugs me about this pool is that it is WAY too hot for swimming lengths. Last year they'd post the temp. and it was always above 85F. I'm sure it was at least that hot today. Swimming is hard enough work, doing it in a bath is just plain uncomfortable. I tried to cool down with a shower, but after ten seconds, that even turned hot.
By the time I got changed and left for home I was sweating. You shouldn't sweat after swimming.