Training Masks, Elevation Training Mask, MMA Mask
Elevation Training Mask is great because it regulates how much air you can breathe in, making it so that you breath less oxygen, in turn making the air thinner (due to the low oxygen intake it's similar to altitude training) . With reduced oxygen consumption the human body changes in several ways. The production of red blood cells and new capillaries (small blood vessels) increase the transfer of oxygen from the lungs to the rest of the body.
