A Ronseal video – it does exactly what it says on the tin/YouTube link. An Olympic swimmer, a former world record holder, attempts to pass the fitness test to become a Navy SEAL, the US equivalent of the SAS.

While the video is largely filmed at one track and doesn’t feature any rotating drone shots or epic landscapes it does feature one thing you may not have seen before – an entirely new swim stroke. It turns out that the Navy SEALs use a combination of breast stroke and free style to swim in a hybrid stroke that looks like you’re constantly changing your mind about what stoke to use while swimming. Check it out.