Hopper from 'Stranger Things' is Beefing Up to Play Hellboy

'Stranger Things’ daddy David Harbour is hitting the gym to beef up for the role of Hellboy. Training with celeb trainer Don Saladino, Harbour put in hours at the gym weightlifting, doing cardio, and cross training. For more videos, subscribe to Mashable News: http://on.mash.to/SubscribeNews Visit Mashable on the web: http://mashable.com/ Give us a follow: Facebook: https://www.facebook.com/mashable/ Twitter: https://twitter.com/mashable Instagram: https://www.instagram.com/mashable/