"I felt good -- I had a good week down here," Pettitte said. "My arm feels great. I've been able to long-toss and throw down here. Everything's good."
Pettitte has been on the 15-day disabled list since July 20, retroactive to July 16, with a strained left groin.
Pettitte expects to make "a couple" of rehab starts and said he is probably about six days ahead of the Yankees' conservative estimates, which said Pettitte would miss four to five weeks.
"It's actually been good," Pettitte said. "I think I'm a little older, so mentally I know there's no rush. I want to be healthy, so I'm trying to take it slow. I've been down here getting after it in the mornings, and this heat is good. It's so hot down here being outside, and I think that's helped me along."