Is it true that during exercise, the oxygen concentration in the blood increases to twice that of resting levels

no its false

Explanation:

i took the quiz on edge and it was false

1. breathe deeply from your lower lungs

2. breathe in and try to push the ring outwards.

3. breathe in through your nose and out through your nose and mouth.

4. avoid raising your shoulders as you breathe in

5. relax!

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