In intense full body exercise our hearts can supply only 1/3-1/2 of the muscles. To deal with this limitation, blood vessels in muscles and organs that are not too busy constrict while those in the working muscles dilate. This redistributes the blood flow, delivers more oxygen where it is needed most, and eases the work of the heart.

These so-called vascular reactions are so vital that Prof. Yuri Verkhoshansky listed them among the most important adaptations of the cardiovascular system and the entire organism to endurance exercise…

To understand how this works, CLICK HERE to read and watch Pavel’s explanation.