Denver Broncos coach John Fox says he feels "tremendous" after returning to work following heart surgery.
The 58-year-old underwent an operation last month to replace his aortic valve, but has already taken the reins back from his good friend Jack Del Rio.
Fox insists that he feels better than before he fell ill while playing golf - and admits that, although he would have preferred an earlier return to work, it was the right decision to honour the doctors' orders.
"I'm actually in better shape now than I was a month ago," Fox was quoted as saying by ESPN. "I feel tremendous, obviously the doctors feel good about me getting back to work.
"I actually would have preferred to have been back sooner, but there was a pretty hard deadline after the surgery of four weeks, and I honored that."
He added: "I feel as healthy as I've ever felt in the last 20 years.
"I'm going to be smart. If all of a sudden I can't hold my eyes open, I'm going to go home. But, like I said, the last three weeks I've been operating pretty much as I did the first eight weeks of the season. It's not like I'm moving furniture or doing roofs. I mean, I sit somewhere and watch football."
Broncos currently lead the AFC Western Division standings after winning 10 of their 12 matches this season.
They recorded their 10th victory on Sunday night, when they beat Kansas City Chiefs 53-28 in Missouri.