Michael Phelps is both the owner of 23 Olympic swimming gold medals and a Baltimore native and big Ravens fan, so he's the man some Ravens players appealed to when they wanted to learn to swim.

Marlon Humphrey and other Ravens want to learn how to swim. Luckily for them, they landed the best teacher available: Michael Phelps.

Several members of the NFL’s Baltimore Ravens recently sought help to improve their swimming skills—and they turned to the greatest swimmer of all time for