Renee Zellweger has opened up about her unique ... potentially causing pain and discomfort in the lower back or neck, muscle ...

Renée Zellweger set the Internet ablaze back in 2014, when she stepped out at the Elle Women in Hollywood Awards in an appearance that had many questioning whether she had plastic surgery.

Renée Zellweger has shared her fitness regime ... potentially causing symptoms like lower back pain, neck pain, muscle weakness, and difficulty in moving the back. READ MORE: Kate Garraway ...