Former NBA player Royce White has begun training in mixed martial arts, and he’s serious enough about the idea of fighting that he’s released a book detailing his transition between sports.

The 6-foot-8, 260-pound former first-round draft pick of the Houston Rockets has been training at the Minnesota Martial Arts Academy, the gym best known as the home of former UFC heavyweight champion Brock Lesnar and former UFC lightweight titleholder Sean Sherk.

White has released a book called “MMA x NBA, A Critique of Modern Sport in America” in which he details his MMA training. He’s made it clear this is not a publicity stunt.

“I’m coming for the UFC heavyweight crown,” White told TheLastRenaissance.com.

White, who has Generalized Anxiety Syndrome, was a vocal critic of the NBA’s handling of mental health disorders. White missed his rookie season due to his condition and ultimately appeared in three games with the Sacramento Kings in 2013-14 after playing in the D-League. He then played with the London Lightning of NBL Canada, where he was league MVP in 2017 and league scoring champion in 2018.