TODAY, DO AN OVERDISTANCE (OD) RUN FOR 45 MINUTES AT LEVEL 1 INTENSITY: One of the key principles of this program is periodization. You will notice that for 3 weeks the total time spent exercising increases, while during the 4th week the volume drops slightly. This gradual increase in training stress, followed by a period of reduced training ensures that your body adapts to the training and you'll improve your level of fitness.
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