4 rounds for time of:
10 traditional burpees
15 knees-to-elbows

#3 – The Metabolic Pathways

Three metabolic pathways provide the energy for all human action. These “metabolic engines” are known as the phosphagen pathway, the glycolytic pathway, and the oxidative pathway. Total fitness, the fitness that CrossFit promotes and develops, requires competency and training in each of these three pathways. Balancing the effects of these three pathways largely determines how and why we do metabolic conditioning, or “cardio,” at CrossFit. We do not favor one or two pathways to the exclusion of the others, and we recognize the impact of excessive training in the oxidative pathway, which is common in so many other fitness programs.