Shields credits yoga for her gorgeous guns. Try the chattaranga pose to sculpt toned triceps like the star's.
And for more on how to sculpt arms like an A-lister, check out the routine Tracy Anderson (the trainer responsible for Madonna and Gwyneth's rockin' bods) created exclusively for SELF!
MORE FROM SELF:
- The joys of sex!
- The dangers of detox diets
- Sex calendar: Get inspired to get busy!
- 20 easy ways to easy eat healthier--right now!