"NEVER you have to lose what you were able to conquer . This means that, if you are a 1500m runner able to run at the end of your winter season, 1 hr at 3'30" (17 km), you CANNOT reach your best results if, in July, you are able running 10 x 300 in 42" with 1:00 recovery, but in 1 hr you are only more able to run 15 km. TRAINING IS TO ADD, NOT TO REPLACE."