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

Michael Phelps, the most decorated Olympian of all time, certainly knows a thing or two about swimming techniques.

Phelps, a Baltimore native, is a longtime fan of the Ravens. During a 2004 game, the team brought him as their special guest, and again in 2012, the Olympian was honored at a home game when he lead the team's offense onto the field.