for certain runs, the best substitution days are your RE training days. Because of the law of specificity of training, you can’t expect a hard bike ride to have the same beneficial effects as a VO2max pace session.Overtraining Any time you experience extreme
focus and concentration, as well as speed endurance.Plan Three – Run long and slowMeghan Arbogast was already a successful marathoner five years ago, with a 2:58 to her credit. But, as she admits, there was a problem. “I was overtraining and killing
