Rob Gronkowski is 31 years old, sat out the 2019 season and has never played for an NFL team outside of the New England Patriots.
As a result, he isn't exactly in what Tampa Bay Buccaneers head coach Bruce Arians deemed "Florida shape" during training camp, per Jeff Kerr of CBS Sports:
"He's probably in New England shape right now. He's not in Florida shape. The heat's kicking his ass pretty good. It's different, man. When you train in New England and come down here, it's different.