The Patriots reported to Gillette on Monday for nine weeks of offseason workouts, but the first two weeks are strictly limited to conditioning drills. Gronkowski said Wednesday – the players’ day off – that he has been working out as much as possible this offseason, even though he can’t fully test his ankle for a little while longer. “I’m just day by day, but I’ve been doing my upper-body workouts, my core workouts for the last like six weeks, so that hasn’t stopped,” Gronkowski said at BTIG’s 10th annual Commissions for Charity Day. “Whatever I can do, I’m going to be doing. Whatever it is, if I can’t do cardio right now, I’m just going to have to make up for it in about a month or two, or whenever I can start.”