Fuels Endurance

We have three petrol tanks, actually three types in many different locations. We want fat to provide energy, and we want carbs on hand when needed. Muscle stored depends on the person, their size, how well trained. Liver stores much less, but it's really important because the liver puts its glucos, its carbs, into the blood,. That's what keeps the brain going. If we ran out of liver glucos or carbs, glacogen, actually, we start all in simpletons sugar.