Another thing to do is to work on their breathing. Because as the lactate starts to rise, this acidosis goes on. And I often talk to people about using the talk test. So, if we were on two treadmills here when we were having this conversation, and we got going faster and faster, we would get to the point where we couldn't talk anymore. That's probably...we're acidotic now, right? So, our lactate would be really high.