Vigorous aerobic activity, from the _______________ of the Physical Activity Pyramid for Teens, is the most effective for building cardiorespiratory endurance.
A. first step
B. second step
C. third step
D. fourth step
Topics:Cardiovascular System Terminology SCI CH2-1 Body Fluids & Circulation Human Genetics Anatomy and Histology of Stomach Type of Dementia Blood Pathology Motor Neuron Disease Facial & Dental Injuries Genetic Engineering Trichology Health and Diseases Dimensions of Wellness Cell Injury Teeth & Microbes
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