Training Mask. Inc continues to create Innovative training devices that are changing the face of fitness. Training Mask is a state of the art resistance breathing device that changes the face of fitness. Athletes such as Stephen Curry (Golden State Warriors), Marshawn Lynch (Seattle Seahawks), Dez Bryant (Cowboys), Dwight Howard (NBA), Indianapolis Colts (entire team at once) and Mike Tyson, and a host of others have all Tweeted pictures while using Training Mask to improve their performance.