Carr said offensive coordinator Kyle Shanahan ran the workout.
"We do their drills, and they really want to tire you out, see how you're feeling, really grind you a little bit," Carr said. "And then you go into throwing routes while you're tired, like a football game. After all that, you do some bootlegs and they want to see how you move on the run when you're tired. Then we do some reads that we have, then they say, 'If you want to see anything else, we'll show you whatever you want to see to make you feel comfortable.'
"That's one thing: I want every team to feel they got to see everything they wanted when they leave Fresno, so it was a great experience."
Cleveland is going to draft a quarterback; the question is how early in the draft. The Browns have two picks in the first round, at No. 4 and No. 26; they also pick 35th. No. 4 is too early for Carr, who generally is considered the No. 4 quarterback in the draft, on the second tier by himself behind UCF's Blake Bortles, Louisville's Teddy Bridgewater and Texas A&M's Johnny Manziel.
The Akron Beacon-Journal reported that Carr's session was "the first known private workout the Browns have conducted in preparation for the draft." It's expected the Browns also will have workouts for Bortles, Bridgewater and Manziel.
Carr at No. 26 makes sense; the worry for the Browns is whether some other team likes him more. There's also the possibility that one of the "big three" fall to 26th. Carr seems unlikely to be there at 35th.
Pettine has called Carr "the best natural thrower in the draft", and he also has said it's possible the Browns draft two quarterbacks this year. In that scenario, the only veteran quarterback on the roster could be Brian Hoyer, who has 18 games of NFL experience.
Mike Huguenin can be reached at firstname.lastname@example.org. You also can follow him on Twitter @MikeHuguenin.