The 27-year-old actress, who is engaged to Hollywood star Johnny Depp, feels claustrophobic inside the gym, reported E!Online.
"I'm active. That's the key. I'm not really one to go sit in a gym. I get claustrophobic, I guess. I'm lucky though. I live in Los Angeles, so I have a lot of time to be outside and be active. That's what I do," Heard said.
It was recently reported that the 'Pirates of the Caribbean' star and Heard are planning to get hitched in an intimate ceremony at his private island in the Bahamas.