Cardio is an essential part of being a mixed martial arts fighter.
If you don't have the cardio, then a three or five round fight might be one of the most grueling experiences of your life.
The ability to go three rounds at your highest pace has proved a winning strategy for many fighters. A perfect example is Clay Guida outworking Anthony Pettis in his UFC debut.
Fighters with larger gas tanks are able to outwork their opponents and ultimately wins their fights.
Let's check out three fighters with endless gas tanks.
Nick and Nate Diaz
Both of these fighters can push the pace of a fight with complete and total ease. Plus, they compete in triathlons as part of their training.
Guida is just a bundle of energy. He's always sticking and moving, trying to find a better striking position or prepare for a takedown.
Sanchez has amazing cardio, as seen in his ability to throw strikes and grapple with any fighter for three full rounds. No matter what his opponent throws at him, Sanchez just keeps moving forward and always stays busy.
The welterweight champion has the cardio to go for days and days.
He has made a habit of going all five rounds with his respective opponents.
He has gone the distance six times in his championship career and has looked fresh and ready for more at the end of his fights.
GSP is one of the hardest training fighters in the sport, so it's no surprise he gets a spot on this list.
The former heavyweight champion is well-known to have incredible cardio.
Velasquez has only gone the distance once in his career, so that isn't much of an indication.
He has been called one of the hardest workers over and over by his training partners and coaches. I don't doubt that at all.
The way Velasquez fights is where you see his cardio in action. He always presses the pace and beats up his opponents.
And once he's done he looks as fresh as when the fight began.
Frankie Edgar has some of the best cardio in MMA today.
He utilizes excellent footwork and maintains the same speed the entire fight.
His fights against BJ Penn, Gray Maynard and Ben Henderson perfectly displayed that Edgar can maintained a freakishly fast pace for five rounds and come out looking for more.
Edgar may be one of the fastest fighters in the UFC today. With his drop to featherweight, he will somehow be even faster.
Now that's a scary thought.
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