This abbreviated Latin phrase means to make things up on the fly, off the cuff-to improvise. In Latin, it literally means according to pleasure. To see the full Latin
phrase, add the letters i-t-u-m to the end of the second word.

m

Explanation:

It is false that during exercise, the oxygen concentration in the blood increases to twice that of resting levels. As a matter of fact, the oxygen either stays the same or decreases, or it may increase slightly than it used to be when the person was resting, but it definitely does not double while exercising. Hope this helps. Let me know if you need additional help!