1 August

I’m a bloody good swimmer, if I don’t say so myself. But 200 metres of butterfly? I reckon I’d struggle to do 10. Also one truth of physics that you can see in the swim races is that swimmers are always faster when they’re underwater. It’s why they had to introduce the 15 m maximum underwater rule, per lap. If you watch the breaststroke for example, everything above the water is really just coming up for air. Nearly all of the actual movement forward comes when they’re completely underwater.