When it comes to shaping up Mischa Barton is nothing but serious. Currently in New York City to shoot the TV show The Beautiful Life, the actress has been hitting the downtown Equinox gym and even hiring a trainer.

“Mischa is really focused on getting into shape,” says a source with knowledge of the situation. Last month, the actress, 23, suffered a breakdown and spent several days in a psychiatric ward after police were called to her home in Los Angeles.

The focus on fitness might be just what Barton needed. “She has big self-esteem issues,” a source close to her told People last month. “She hates her legs. She isn’t comfortable with her body. It’s been a big source of stress and self-hate.”

Since relocating to New York City in late July, Barton has been trying to change that. “Mischa has been doing a lot of conditioning with weights as well as cardio on the treadmill, and some kickboxing,” says a source. “She’s been very consistent and she seems focused.”

Source, Bauer-Griffin