Jennifer Aniston wants Justin Theroux to workout less.

The 45-year-old actress is reportedly creeped out by her fiancé's bulging veins and muscular physical, and wishes he would stop training so hard at the gym.

A source told the National Enquirer: ''Jennifer is begging Justin to cool it with the free-weight workouts. She says she's turned off by his ultra-muscular body. She wants her man to be in shape, but it creeps her out that he has veins jutting out on his arms, legs, chest and neck.''

The former 'Friends' star previously credited Justin, 42, whom she has been dating since 2011, for helping her to relax her own diet and fitness routine recently.

She said: ''The last couple of years since meeting this man have made me gain a couple extra pounds.''

However, Jennifer tries to works out on a daily basis, doing 45 minutes of cardio and 20 minutes of yoga, so she can indulge in calorific treats occasionally.

She said previously: ''It catches up to you, and you take care of it. But it's still fun. It was all in the name of love!''