Massive Pump!!!!

Just Curious why it is that when Im on Winny I get such a huge Fu*kin pump???? Dont get me wrong its the shit but Im just curious about a scientiftic explanation...
Thanks
BIGTEX:lift:

You think winny gives you a pump try EQ gots to love the pump.

or d-bol

Winnie as with most AS increases the amount of oxygen carried by the blood stream!

So after doing a couple of sets the blood is rushing into your muscles to clear out the lactic acid buildup and voila' you get
a better pump.

Test gives me a pump in the legs just walking up the stairs

:lift:

mallet is rite on, the oxygen increase is due to a rise of RBC (red blood cells)