updated 07/31/2013 AT 1:00 PM ET
•originally published 07/31/2013 AT 4:45 PM ET
Sharon Stone has one of Hollywood’s most enviable bodies – and she credits it to an unconventional workout.
“I put on dance mixes and I really dance my brains out at home because I enjoy that,” the actress told PEOPLE at the New York premiere of her upcoming film Lovelace at the Museum of Modern Art on Tuesday.
“That saying – ‘Dance like nobody is watching’ – I do that. I dance like nobody’s watching and I dance hard until I sweat and I think that that s very good. It s good for the mind and the body.”
Along with her dedication to her dance moves, there’s more that keeps Stone, 55, in phenomenal shape.
“I joined a gym,” she said. “I used to just do Pilates. I had pilates in my house but I have found that since I’ve hit 50, that I’ve felt that I’ve needed more muscle tone and I started using more weights. So I joined a gym and I do weights. … I really like it.”
In the film, Stone plays Dorothy Boreman, Linda Lovelace’s mother, opposite Amanda Seyfried. Lovelace, the biopic about adult film star Linda Lovelace, opens Aug. 9.