Comment by jimmygrapes

Very relevant point. They sure as hell don't make the "Olympic tier" pools at my gym anywhere near body temperature; I probably spent the first few minutes psyching myself up for the shock then another few minutes getting used to the temperature and recovering from that shock. I don't know for sure but based on my understanding, based on the size of the pool my body would expend energy at a tremendous rate even if I just grabbed the ladder rail and stayed still.