Since he retired from the Yankees last year, Alex Rodriguez has found success in several endeavors

Since Alex “A-Rod” Rodriguez retired from baseball last August, he has been busy following one of Warren Buffett’s adages: Invest in what you know.

“I basically lived in a gym for the last 30 years,” he recently told Fortune to explain why his company, ARod Corp., invests in fitness centers. “I like the fitness business because it’s asset-light. It generates great cash flow.” His company recently bought the rights to build UFC Gyms in South Florida, he added.

Rodriguez has found success in several off-the-field endeavors, and it seems that everything he’s done has been praised.

He worked as a commentator for Fox Sports during the 2016 playoffs. A chat he had with his colleagues Pete Rose and Frank Thomas off the air ended up going viral as Rodriguez was lauded for his curiosity and knowledge. See the intensity with which he asks his colleagues questions about their playing days:

And he’s shown the same skills as the head of ARod Corp., which invests in what Rodriguez “knows.”

His company owns or operates over 20,000 apartment buildings. “It’s a sector I understood. We never owned anything growing up. We rented…I remember playing ball in the yard, and I said, ‘Boy, if I can be the landlord and not the tenant, I would jump at that,’” he told Fortune.

More evidence that he invests in subjects he’s passionate about: Although he personally owns shares of tech giants like Amazon AMZN, +0.85%  and Facebook FB, +0.36%  , ARod Corp. doesn’t invest in startups or smaller tech companies. As he told Fortune, “I never understood the concept of Silicon Valley — all these companies lose hundreds of millions of dollars every quarter. And they just keep skyrocketing to the moon.”