Last season, Bill Belichick chastised Rob Gronkowski in front of other players for being a client of Alex Guerrero of TB12.
Gronkowski has begun working out at TB12 this offseason. Gronkowski wanted to become more pliable as he's suffered a number of injuries over the past few seasons.
Gronkowski has been playing at a thinner body weight.
Gronkowski has been irritated at Belichick ever since the incident.