After extensive research and clinical testing from the UNIVERSITY OF NAIT the Training Mask 2.0 has made remarkable advancement in the fitness and training industry. Training Mask 2.0 takes all the amazing "Diaphragm Resistance Technology" from Training Mask 1.0 and compiles it into a less obtrusive, amazingly comfortable silicone mask that fits over the nose and mouth.

Our multi-level resistance system reduces air flow through our patent pending flux valve system. Training Mask 2.0 promotes increased lung capacity by forcing you to inhale fuller deeper breaths. When your body adapts to the resistance your lungs will be trained to take deeper breaths and use oxygen more efficiently. A short explanation of how this works is simple. When you breathe against resistance the lining in the lungs essentially stretches out allowing the alveoli’s surface area to become "stretched" thus in return allows for more blood flow to the alveoli for more (oxygen transportation). When you increase "surface area" you increase red blood cell count that will be able to carry more oxygen out to the extremities

While using Training Mask 2.0 the conditioning of your lungs significantly increases along with endurance and diaphragm strength. Training Mask 2.0 will benefit your respiratory system as your overall cardio and endurance will improve with continued use.

**There are many breathing devices and respiratory trainers used by hundreds of elite athletes for sports performance and by other users for health and fitness. Some of these devices are invented to increase strength of the respiratory muscles. Numerous clinical trials have found that these devices can increase endurance and VO2max (maximum oxygen absorption during most intensive exercise), improve lung function tests (VEF, PEF, FVC, and VEmax), lower heart rate for the same load, reduce medication (drugs) and symptoms, improve quality of life scores and lead to other beneficial health effects.

**Furthermore, with correct applications, breathing devices can increase body oxygen levels and produce profound effects on long term endurance, VO2max, duration of recovery from injuries and intensive training, together with life quality effects related to sleep, energy level and digestion. This review is focused on these oxygen-related effects of various breathing techniques.