Sandra Bullock and George Clooney did a lot of Bikram yoga, met astronauts and drank while preparing for "Gravity."

Sandra Bullock. UPI/John Angelillo

Sandra Bullock and George Clooney opened up about training for their upcoming movie "Gravity" during a press conference to promote the film, which opened the Venice Film Festival, on Wednesday.

The movie is about a medical engineer (Bullock) and an astronaut (Clooney) who are stranded in space after debris from a satellite crashes into their space shuttle.

Asked about how they trained for the role, Clooney said, "Sandy and I did a lot of Bikram yoga together."

"We're good that way. Very flexible," Bullock added.

Bullock, who called her role in the film the "most challenging" she's had thus far, told reporters she also trained with real astronauts.

"They were incredibly helpful, and they gave me an inside visual as to why they do what they do, she said. It was the craziest, most bizarre, and most challenging shoot Ive ever done.

Regarding how she stays in such good shape at 49, the "Heat" star explained she thoroughly enjoys dancing.

"I love to dance, I have a background, I was a gymnast, I was a dancer, I just don't like gyms I'm very bored so I'm just cardio, music, just blast the music for an hour and don't stop moving your body. Lightweights," she said. "I have a 40 pound 3-year-old who still is a baby and insists on being carried so I must stay strong. So just that."

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Sandra Bullock, George Clooney did yoga for 'Gravity'