What's in a McRib? Stuff Used to Make Gym Mats

http://www.mindbodygreen.com/0-3410/Whats-in-a-McRib-Stuff-Used-to-Make-Gym-Mats.html

Further reading: http://healthland.time.com/2011/10/27/why-lovin-the-mcrib-isnt-a-heart-smart-idea/