6. Peyton Manning
Peyton Manning played 18 seasons in the NFL. Despite falling on the wrong side of 30s before his peak, he never gave up. His strict physical regime along with a calculative mind allowed him to maintain himself as a stellar player. He graduated with an impressive GPA of 3.61. He retired in 2015 and seems destined for hall of fame.
Manning is unique because he guides his team with a coordinated verbal exercises. Before each game, he gathers all the players around in a systematic way and chants slogans while giving a pep talk. He is known to have extensively read defensive strategies of all his opponent teams. This physical endurance and quick thinking has earned Manning four Super Bowl championships.