(CNN) – America's 41st president didn't hide anything during the taping of an upcoming documentary about his life and administration, the film's producer says.
"There were no areas that were off-limits," Jerry Weintraub said in an interview with CNN's Fredricka Whitfield. The film about George H.W. Bush, titled simply "41," will air on HBO Thursday evening at 9 p.m. ET. CNN, like HBO, is owned by Time Warner.
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"The fact of the matter is that if you look at the president's past, he's never bragged about anything in his dossier," Weintraub continued. "He was the most prepared man that ever entered the presidency, because of all the jobs that he did leading up to it."
In the documentary, which was filmed at Bush's ocean-side home in Kennebunkport, Maine, Bush describes how he felt when his son, George W. Bush, was elected president in 2000.
"Very emotional for me. Very proud father," Bush says. "First time it's happened I guess in the history of our country, except for the Adamses. It was mindboggling, it was enormous. A source of great pride for the family, for the father."
Weintraub said he didn't get the sense that Bush was preparing any of his sons to enter political life.
"I don't think he groomed them to be anything except to serve the country and serve themselves and be decent people and citizens," Weintraub said. "His family is a wonderful, wonderful family. Barbara Bush is a great partner for him. She's an extraordinary woman. His children are terrific. And I don't think he ever set out for his son to be president of the United States. I know he was extraordinarily proud of the fact that his son was president twice."
The film features a reflective moment from Bush, who recently turned 88, about getting older.
"I can't do sports, which I've lived my whole life doing," Bush says. "Nobody asks me to be on the team anymore. I remember I used to stand around - no, no, next to you, I'll take you, you, you. I'm standing there, nobody wants me. Because I can't move very well. This is a metaphor, but I miss it."
Bush's reflection on aging eventually lightens up as he turns to the subject of boats.
"Boats, I'm still in the game," Bush says. "I'm now privileged to have a very fast boat, a very powerful boat. Everyone wants to go on it. It's a wonderful, wonderful outlet for me."
Weintraub said Bush, while a funny man, took the job of commander in chief very seriously.
"He was very serious about his job as president of the United States," Weintraub said. "He wasn't cavalier. And when he sent kids to war, he knew what that was. Because he went himself. And he almost died. So he was a serious man. Very, very serious man. He has a great sense of humor, and he can't putt very well, but other than that, he was a very serious guy."