Most people know that there are various blood “types,” as defined by two major contributors: protein antigens on the surface of erythrocytes (red blood cells, or RBC’s) classified as either “A” or “B...
Kevin Beck is a senior writer for Running Times magazine, book editor, and online endurance coach whose considerable slate of freelance work focuses on health, athletic training, and fitness topics. He was the seventh American at the 2001 Boston Marathon and was second in the 2004 50-kilometer national championships. Visit him on the Web at www.kemibe.com or e-mail him at kemibe@gmail.com.
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