Erik Ravnan from Norway can swim backwards.
Ravan swims the front crawl, breaststroke, backstroke, and butterfly, but moves feet-first in the pool.
Ravan says the backwards swimming technique is used for agility training.
The second half of the video is reversed.
"I urge everyone to try a little backwards swimming," he says. "It is fun and a great way to show off at the pool."
You can watch the full seven minute video here.