It doesn't it just pushes veins closer to the surface of your muscles
It does have good affects:
"In summary, regular vigorous exercise produces a training effect by "remodeling" the body's entire cardiovascular system over time"
Source:http://www.texasheartinstitute.org/HIC/HeartDoctor/answer_66.cfm
Exercise increases peripheral blood flow. This is due to the effects of adrenaline and noradrenaline on vascular smooth muscle. The muscle relaxes to allow a greater volume of blood (and therefore, O2 and other nutrients) to reach the tissues.
exercise temporarily increases the capillary density at muscle sites, it is possible to improve these changes in capillary density with training
The blood starts to flow faster.
Peripheral blood flow refers to blood flow that occurs in the extremities as opposed to blood that flows to the brain, heart, lungs, and vital organs.
Strength of pulses is one clinical indicator of peripheral blood flow. Another is capillary refill time.
Peripheral resistance
Anemia
Peripheral resistance
Vasodilation and decreasing blood viscosity
In cases of extreme trauma, such as blood loss, the body tries to preserve the internal organs by restricting peripheral blood flow.
Vasodilation and decreasing blood viscosity
Decreasing peripheral blood flow
it is called peripheral resistance.
Yes. As you exercise, the vessels of blood in the muscles dilate and thus the blood flow greatly.