your blood vessels dilate to cool you off. During the process of dilation, your fingers and hands may swell up, particularly if you sweat a lot when you work out.
"I know that you have been on this cliff now for what seems like a long time. Your feet and fingers are cramping(痉挛)up and your forearms feel as though they are on fire. But, Alexis, you are strong, look how far up you are already. You have taken one of the more...