Jennifer Aniston and Justin Theroux

Jennifer Aniston's fiance Justin Theroux has a great body and he wants to keep it with a home gym.

The screenwriter and actor is determined to stay in shape so has spoken to his fitness fanatic fiancee Jennifer Aniston about setting up a fully-equipped workout room in their new house.

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

Justin and Jennifer take care of themselves and the actress recently revealed they enjoyed spa treatments together on a post-Christmas vacation to Mexico with friends John Krasinski and his wife Emily Blunt and Jimmy Kimmel and his fiancée Molly McNearney.

Showing off their holiday pictures on Jimmy's talk show, Jennifer 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.''

© Bang Showbiz