So, in athletics we know there are super shoes which greatly contribute to the breaking of world records (Kelvin Kiptum, for example, was surely a great athlete, but there is no doubt the shoes played a big part in his marathon WR, like with most recent WR's). What's the thing in swimming that has made world records been broken again and again, year after year?
Are they just on an overall low level, or are there certain equipment developments, or faster pools, or, I don't know, wetter water that makes WR's be broken so often in swimming?
Surely it's not just 'athletes get better', because athletes get better in every sport.