altitude training

Just as altitude training increases endurance in humans, so putting killer T cells through a ‘fitness regimen’ apparently toughens them up.
Let's talk about why masks have been around since 2009 and most people are only hearing about it now, in 2014.
Many athletes use altitude training or baking soda to improve performance. But what happens when you combine the two?
I think every person on the planet has these masks wrong right now, including the company that makes and sells them.
Altitude training has long been used by athletes, but new research examine more closely. Athletes can use this information to precisely time out their training to line up with competition day.