I have a term for the blood-red, hot feeling you get when you are having a good run. The kind where you are completely warmed up and feel no pain (hopefully not even in your bones or tendons) and it just feels good and hot and limber.
Like, my leg muscles feel so warmed up that they are just pumped and squishy from heat, blood and sweat.
This is what I call, "achieving squishy meat."
I know it makes no sense; comes from the right side of the brain. It's how I feel.