Definetly A. They work on the ability to supply oxygen to the lungs from the heart, to help them run.
The circulatory system is also known as the cardiovascular system. They both allow blood to circulate throughout the body, transporting nutrients, oxygen, and carbon dioxide.
I hope this helps! :)
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<em>A minimum of 48 hours' rest between circuit training is required for adequate recovery. You should perform one set of eight to 12 repetitions two times a week if you're just beginning. Increase to three days a week or to two sets, or both.</em>
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