What Doesn't Kill Us: How Freezing Water, Extreme Altitude, and Environmental Conditioning Will Renew Our Lost Evolutionary Strength

by Scott Carney

However, most people see a dramatic improvement in how long they can hold their breath when they repeat the cycle of hyperventilation and breath-holding for three or four cycles—or for a total of about 10 to 12 minutes. And now comes the really cool part. POWER PUSHUPS