Anna is training to run a half marathon. she finds that if she runs at a slow, steady pace, she doesn't fatigue as easily and her muscles are not as sore afterwards. today,anna has been jogging for about 45 minutes and is still full of energy. but anna can see that a thunderstorm is on its way and she begins to run at a top speed to avoid getting wet. she starts to breathe heavier and heavier, eventually she gets so short of breath she has to stop. explain why aruna has to stop running. use chemical changes and energy conservations to support your answer.​