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What happens here is that your cells run out of oxygen, you run out of energy, and your muscles feel sore due to the lactic acid dumped into the muscle tissues by your cells. What the body's cells are pretty convincingly trying to tell you here is- stop exercising or we will die.
During exercise, your body consumes large amounts of oxygen. In fact, this is part of what helps you to lose weight. The more oxygen your body consumes, the harder that you're working out. It's one reason that you typically lose a lot of weight when you first start working out.ecause your body is not accustomed to working out as much, you use a lot of oxygen during the course of your initial workouts. This oxygen is required to feed your muscles and keep them working. As you get into shape and get used to working out, though, your body doesn't require quite as much oxygen as before.