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Do Hills and Sprints Cancel Your Zone 2 Benefits?
Does a short climb, town-line sprint, or brief surge above Zone 2 undo the benefits of an endurance workout? Paul Warloski and Dr. Paul Laursen explain why the answer is generally no. Brief excursions above LT1 or VT1 don’t suddenly erase aerobic adaptations, and short bursts can even provide useful neuromuscular stimulus. The bigger issue is repeatedly turning easy training into moderate or hard training, accumulating fatigue and compromising the quality of the sessions that are supposed to be hard. The discussion covers the physiology behind Zone 2, fat and carbohydrate use, heart-rate…
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