An adult has about 40 million miles of capillaries in their body and they carry 1 cell at a time.

These capillaries are our fuel lines that carry the blood our muscles need to function, but only 25% of these capillaries are open during rest. 

But once warmed up through exercise they will dilate, and all become fully functional.  So that’s 4 times more food and oxygen to the muscles. So always make sure you allow time for your warm up if you want to maximise your performance Ref Boron and Boupaep text book of medical physiology, 2nd Edition, p.46