Joe Mazzulla’s MMA training offers a different way to understand the coach who led the Boston Celtics to the 2024 NBA championship. Basketball may be his profession, but some of the lessons he brings to the sideline come from being challenged on the mats.
For Mazzulla, MMA is more than a hobby. It’s a classroom.
In a July 2026 conversation with Ariel Helwani, filmed around his training with Eric Nicksick at Xtreme Couture, Mazzulla explained how combat sports influence his approach to coaching. He described years of on-and-off training, using it to test himself mentally and physically while learning from another coach’s methods.
He sees connections between the two sports in preparation, communication, and responding under pressure. But one of the most useful lessons comes from putting himself in the position of the athlete.
Training Helps Him Understand His Players
Mazzulla has tremendous respect for fighters and the mindset required to compete.
Combat sports force athletes to solve problems while tired, uncomfortable, and under pressure. Preparation matters, but so does the ability to adjust when something goes wrong.
For Mazzulla, training also provides mental clarity. It gives him room to take a breath, reassess, and return to basketball with a refreshed mindset.
There is another benefit. Coaching an NBA season does not put him through the same physical demands his players face. Training gives him his own experience of fatigue and frustration, helping him better understand what he asks of them.
To Mazzulla, that creates empathy.
The connection is not that a training session replicates an 82-game schedule. It is that being challenged himself makes the physical, mental, and emotional demands on his players harder to overlook.
He also admires how exposed fighters are in competition. Success and failure happen in full view, and they have to deal with both. He sees a connection to the pressure of an NBA season, with its travel, hostile crowds, and constant expectations.
What Eric Nicksick Teaches Him About Communication
One of the biggest connections between MMA and basketball for Mazzulla is communication.
His interest in Nicksick goes beyond the workout. He studies how the coach builds relationships with fighters and delivers information they can use under pressure.
The break between rounds offers an obvious comparison to an NBA timeout. There is limited time to explain what is happening, make adjustments, and send an athlete back into action.
How much information is useful? What needs to be said immediately? How can a coach simplify a complicated situation so an athlete can execute?
Mazzulla’s interest also extends to communication during the action. Instructions from the corner or sideline can help, but they can also become a distraction. Timing and delivery matter as much as the adjustment itself.
He praised Nicksick’s ability to make those messages clear while recognizing that different fighters may need different approaches.
Every player is different. Every situation is different. Great coaches have to understand the person before they can reach the player.
Different Sports, Similar Decisions
The comparison also makes sense strategically.
In MMA, a fighter has to account for an opponent’s strengths, weaknesses, and tendencies while finding opportunities to use their own best weapons. Basketball presents a similar challenge, with matchups shaping what a team can create and what it needs to take away.
Improvement brings another question. How much time should an athlete spend addressing weaknesses, and how much should go toward sharpening what already makes them effective?
Those decisions do not have a universal answer. They depend on the athlete, the opponent, and the situation. A different sport can give a coach another way to think through familiar problems.
“Great coaches have to understand the person before they can reach the player.”
The Same Mindset That Built a Champion
Joe Mazzulla’s MMA training may not be the reason the Celtics won a championship, but it offers insight into the mindset behind their coach. He keeps looking for ways to improve, including opportunities to train while traveling with the team.
“It’s us against the city.”
That was how he described the competitive feeling of visiting another team’s territory. Training helps him stay fresh mentally and physically while maintaining that edge.
The same qualities required in fighting, including discipline, preparation, communication, resilience, and adaptability, are qualities Mazzulla values in basketball. His interest goes beyond the techniques. He studies how fighters handle pressure, how coaches reach them, and what it takes to keep improving.
Those lessons have become part of how he leads. Coaching may give him authority, but training keeps him accountable to the same lessons he asks his players to learn.
