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This depends on the level of strain the exercise creates on average you cannot go much longer than two minutes without fresh oxygen to your brain and major organs however in such cases your organs will take the oxygen from the oxygenated red blood cells to the lungs and brain to enhance the chances of the oxygen ports such as the nose and mouth will inhale providing more fresh oxygen

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14y ago
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Q: How long can the body produce energy during exercise without oxygen?
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