This is James Heptonstall. He wanted to see if he could run faster than the tube. So he decided to race it from Mansion House to Cannon Street.
Ready, steady, go!
To beat the tube, he had 80 seconds to run through the station at Mansion House...
...through the streets of London...
...to Cannon Street station...
...and back on to the same carriage he had been riding 80 seconds before.
London's commuters are very impressed.
Especially this lady.
Watch the incredible video here.
Or if you prefer long distance running, watch the pair's other video, which shows Carroll racing the tube all the way from Moorgate to St James's Park.
Mr Heptonstall told the Evening Standard that they may try another tube race in the future.
So if you see some guy running at breakneck pace through the tunnels of Kings Cross with a GoPro round his head, don't panic.