<prompt> Severe muscular exercise causesLactic acidosisKetoacidosisHypothermiaCPK levels  <response>: Intense Exercise. When you exercise, your body uses oxygen to break down glucose for energy. During intense exercise, there may not be enough oxygen available to complete the process, so a substance called lactate is made. Your body can conve this lactate to energy without using oxygen. But this lactate or 