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Felony fitness! Teresa Giudice is getting buff behind bars.

The imprisoned "Real Housewives of New Jersey" star is reportedly using her time in the Federal Correctional Institution in Danbury, Conn. to work on her fitness.

RELATED: Teresa to be released early

"She's getting in the best shape of her life," an insider told Us Weekly. "Every night she hits the gym and has been asking friends to send her workout videos."

RELATED: Teresa is lying to girls about why she's in prison

Currently serving a 15-month sentence for fraud, Teresa, who works as a laundry worker, is also keeping a journal of her post-prison goals.

RELATED: Teresa's new year's resolution: Eat less carbs

Aside from a hot bath, a spray tan (after all, she is from Jersey), and a massage, "she hopes to land the cover of a magazine and get her own cooking show," the source said.

Until then, though, she'll be in the weight room.