Others have muscle which burn less fuel and are not so reactive, but can be active for a much longer
period of time. I wonder if those of us
with the stamina have higher blood pressure. My older brother has much lower blood pressure than me, and has the type of muscle which burns out quickly. He has no heart trouble either. He tried running with me once, he sprinted ahead showing off, and after just half a mile he was collapsing on the floor drooling for air.