Okay, I can do a 25. I get it, you swim hard, head way down. I'm bottom heavy, but whatever. I've seen some sets where there are 4X100 like that. What am I missing here? I'm actually a pretty decent swimmer, most of these sets are distance, presumably triathlete friendly, and I'm generally a much better swimmer than even very good triathletes (better than the few locals who make Kona). But I simply cannot do a 100 without a buoy, much less 4 of them.
Am I missing something? What am I doing wrong, here?