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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.
To prevent your body from having low blood oxygen levels normally, you need to fight through your early workouts to get yourself back into shape. One reason people are so sore when they work out for the first time is that their blood oxygen levels are low during exercise and, as a result, the body doesn't get the oxygen it needs. To improve your blood oxygen levels, continue to work out to get your body used to exercising more often.