I want to say a couple of things.
Tim didn't say that he learned swimming in ten days. He ALREADY knew how to swim. What he learned was to swim more or less effortlessly.
He used a system called Total Immersion. I know the Total Immersion techniques too.
Basically, the whole idea is, well, effortless swimming. There is a lot of focus on being streamlined and reducing drag, maximising your glide and so on, etc.
To give you an idea of how it works, well, in the past I would swim a 30-metre lap with, say, around 13 strokes with each arm. Once I started swimming the TI style, the 13 strokes became 12, then 11, then 10, then 9 or 8.
Now obviously it's more effort to do 13 strokes than 9 or 8. So what's happened here is that just by holding your body in the most efficient, streamlined positions, you have reduced the effort required to swim one lap.
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