How does a proper warm up affect blood flow?

"Blood flow increases" is the one way among the following choices given in the question that a proper warm up affect blood flow. The correct option among all the options that are given in the question is the first option or option "A". I hope that this is the answer that has actually come to your help.

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During a proper warm up the heart beat rises, allowing more energy to go to your muscles. This increases blood flow through the body.

The best way is to swollow and hold in your breath