First, serious marathon runners and cyclists would train in the mountains, where the lack of oxygen at altitudes above 7,000 feet persuades the body to produce more oxygen-bearing red blood cells. Next, serious and well-off runners and cyclists converted their bedrooms to altitude chambers (cost, roughly $20,000). Now comes the poor athlete’s altitude chamber, known as altitude tent, and selling for a mere $6,000. Do they work? The short answer is kind of. In this story in the LA Times one man tries out a tent while training for the Boston Marathon.
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Medical science can suggest a normal range of body mass index values