In case you missed a re-tweet from Efficient Exercise, here’s a video of Keith Norris attempting to chew through his mouth guard by way of the CZT Vertical strength training equipment.
Beastly!
In case you missed a re-tweet from Efficient Exercise, here’s a video of Keith Norris attempting to chew through his mouth guard by way of the CZT Vertical strength training equipment.
Beastly!
Skyler Tanner 
My teeth (and mouthguard) have yet to recover 🙂