We are the Real Training Mask - We have pioneered and have become the leader in performance breathing devices. Genuine Training Mask breathing exercise devices were engineered to apply variable levels of tension to the breathing muscles by controlling air flow which increases tension on your breathing muscles. Burn the Fat - Build the Muscle - It?s not all about endurance and stamina ? the Training Mask has been scientifically proven to increase your body?s growth hormone levels by up to 25% with exercise. Increased growth hormone will help you burn more fat, build more muscle, and recover faster after a tough workout. Build Stamina for the Long Run - Using the Training Mask in your workouts will decrease the impact of fatigue in your training sessions by increasing your threshold potential, activity strength at exhaustion, and stamina. More stamina and endurance make the hard workouts EASIER. Due to variances in monitor color, and lighting, the color of some items may differ slightly from the photographs About us: Vanessa Jane is a family-owned business based in Indiana. We sell only authentic merchandise from brand new to used, and list new inventory daily. Make sure to put us on your favorites to see what's new each day! We source all of our inventory from reputable sales channels, including: Macy's Amazon Walmart Home Depot Office Depot Lowes Build.com And many more Box N30 (M/Black-1) Box N10 (M/Black-1) Latest Location moved to on 4/30/24 Relisted: by Martha Russel Listing SKU: VJ4697047072853 Listing SKU: VJ4697047072853