
Regular exercise increases blood volume, which allows more blood to get to the cells. The result is a greater flow of oxygen to a greater number of cells throughout the body, thus helping the cells work to their capacity and allowing the heart to become stronger.
Pg. 185 - NASM Essentials of Personal Fitness Training, Third Edition
Danielle asks, "Who doesn't want a stronger heart?"
I've never known someone who regretted a workout.
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