The 10 Best Cardio Fighters in MMA: Gas Tanks That Never Quit

Gas tank: S+ (our engine)

The most relentless engine in the sport, full stop. Merab is the only fighter in UFC history past 100 career takedowns, and he piled up 18 in a single fight against Cory Sandhagen. In 2025 he became the first bantamweight ever to defend the belt three times in one calendar year — routinely looking fresher in round five than his opponents did in round one.

Gas tank: S+ (our engine)

Still perfect at 20-0 as a pro, largely because nobody has solved his motor. He smothers opponents under wave after wave of wrestling and pressure for fifteen minutes without ever dropping his output.

Gas tank: S+ (our engine)

Whatever you make of the act, the cardio is genuinely elite. Colby throws volume and chains takedowns at the same rate in the championship rounds as he does in round one, a pace that has broken several top welterweights.

Gas tank: S+ (our engine)

“Mighty Mouse” set the UFC record with 11 straight title defenses and entered the Hall of Fame in 2026. He held a frantic, all-phases pace for twenty-five minutes that no flyweight could live with.

Gas tank: S+ (our engine)

Retired a perfect 29-0. His cardio was a weapon disguised as wrestling — the relentless mauling broke opponents mentally long before the final bell ever rang.

Gas tank: S+ (our engine)

At his peak, “El Cucuy” ran off a 12-fight win streak on the back of a famously bizarre conditioning routine and a pace that dragged everyone into deep, ugly water where he thrived.

Gas tank: S+ (our engine)

Volume is just cardio with a target. Holloway owns the UFC record for most significant strikes landed in history, and his output only climbs as the fight goes on — capped by his one-second-left knockout of Justin Gaethje at UFC 300.

Gas tank: S+ (our engine)

A cardio cult hero who has never been finished by strikes. He routinely got stronger into the second and third rounds, never more famously than when he took the McGregor fight on short notice at UFC 196 and submitted him.

Gas tank: S+ (our engine)

The original Stockton iron man. A triathlete-level engine who walked opponents down behind a wall of nonstop punches until they wilted.

Gas tank: S+ (our engine)

A true workhorse who fought anyone, anywhere, on any notice, kept a high pace for his entire career, and eventually became middleweight champion — all with one good eye.