Fartlek hills are a more informal work out than timed fartlek intervals and will not have a prescribed duration. Choose a course with rolling hills. You will perform the majority of the work out at a base or endurance run pace, but will increase your tempo and speed on the uphill portions. Do not sprint, but steadily increase pace until you crest the hill. At the top of the hill you should be slightly below or above your lactate threshold heart rate.
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