One of the best measures of running fitness is lactate threshold (LT), which is the running speed or heart rate at which lactate — an intermediate product of aerobic metabolism in the muscles — begins ...

One critical component of customizing fitness and training is having a solid gauge of fitness and its progress over a season and year-to-year. Outside of laboratory-based tests, a standardized field ...

To heartwire, Healey said he was not surprised by the outcome but was surprised by "how robust the results were. It was like kicking the ball 10 yards over the goalpost, it was that clear-cut that it ...