What methods would the body use to provide a person with energy throughout a race?

Ventilation, increase heart rate.

Explanation:

ventilation to keep cool and heart rate to provide enough oxygen for body use.

the core of the sun is so hot and there is so much pressure, nuclear fusion takes place, hydrogen is changed to helium. nuclear fusion creates heat and photons. when the heat reaches the earth it warms the molecules of the atmosphere, and they warm other molecules and so on.