The Effects of Exercise on Veins

Up to 70% of our blood volume sits within the veins, which works out perfectly when you spoke about that athlete that needs 20, 20 liters. So they rely actually on skeletal muscles to do a lot of their pumping for them. Squeeze in those veins and bringing it back. And so you'll get in more preload, which is then you're enhancing that filling and then more blood's exiting.