Justin Theroux reportedly wants to install a gym in the California house he shares with his fiancee Jennifer Aniston, a source told OK! magazine.

In order to stay in shape, the screenwriter and actor, 41, spoke to Aniston, 43, about setting up a fully-equipped workout room in their home.

''He already works out every day for 90 minutes. Justin wants to have his dream gym at their house," a source told the magazine. "He's even thinking about hiring a valet to coordinate it all.''

In a recent interview on Jimmy Kimmel Live, Aniston revealed that she and Theroux, along with other friends, enjoyed spa treatments together during a New Year's holiday vacation in Mexico. Other celebrities on the trip with Aniston and Theroux included John Krasinksi and his wife Emily Blunt, and Kimmel with his fiancee Molly McNearney.

While sharing holiday pictures on Kimmel's talk show, Aniston said, ''All of you boys were secure enough in your masculinity to join the women on spa day. So the girls had massages, whilst the men were having manicures and pedicures.''

The "Horrible Bosses" actress got engaged to Theroux in August of 2012. They share a Beverly Hills mansion together that includes four bedrooms and seven bathrooms.

An insider said Theroux has been thinking about having a child with Aniston ever since he proposed. The source said, "The night he proposed, he told Jen that he wanted her to have his child. She's been joking that in a perfect world it will happen on the wedding night."

Rumors circulated recently that Aniston was seeing a therapist to help her overcome her "obsession" with her ex-husband Brad Pitt. Sources reportedly told Star magazine the former Friends star has "gone back into one-on-one counseling" for the issue that has been "killing her softly."

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Jennifer Aniston, Justin Theroux