In July 2015, Gronkowski co-wrote a memoir titled It's Good to be Gronk with Jason Rosenhaus.
It was published by Simon & Schuster's and Derek Jeter's Jeter Publishing and became a New York Times Bestseller
Started in 2015, Gronkowski and his four brothers operate Gronk Fitness a fitness business that sells Gronk-branded gym equipment and has partnerships with other fitness companies including Life Fitness and Xtreme Monkey.
Gronkowski has stated that partying improved his playing abilities noting, "You go out and get refreshed, and it just makes you want to go back out on that practice field and keep going hard."
During an on-air interview with ESPN Deportes after an AFC Championship win in 2012 he responded in Spanish answering, "¡Yo soy fiesta!" (literally, "I am party!") when asked how he will celebrate the victory
The clip went viral, and his Gronk Nation, L.L.C. later trademarked the catchphrase.
The clip went viral, and his Gronk Nation, L.L.C. later trademarked the catchphrase.
In March 2021, his first NFT card collection sold for $1.2 million.
In October 2020, ZooTampa at Lowry Park named their newly born greater one-horned rhino "Gronk" to celebrate Gronkowski joining the Tampa Bay Buccaneers.
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