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In running, performance is easily quantified as the fastest time over a given distance.  The runners with the fastest times often have the best ability to utilize oxygen (VO2 max), process metabolites and substances involved in energy utilization (lactate threshold), and the most efficient running form.  Efficiency in running is described as running economy, similar...

Last year an estimated 30 million people ran at least 50 days for exercise and health benefits (Running USA).    The fastest growing segment of the running community includes older adults who gain impressive cardiovascular, muscle, bone, and mental health benefits compared to their sedentary peers.   In addition, contrary to popular but incorrect old...