CHEST The Animal Underground: Rob Hall, Chest Day Last updated: October 12, 2016 7:41 PM ANIMAL Published October 12, 2016 Share 0 Min Read Newest Animal athlete Rob Hall shares a thorough and intense chest workout. Share This Article Facebook Twitter Email By ANIMAL Follow: Animal. The makers of hardcore training packs including the venerable Animal Pak for dedicated weightlifters since 1983. Previous Article Kris Gethin On The Importance of Hydration Next Article John Meadows Explains Mountain Dog Back Training