All considerations for oxygen for a trip to the moon are assumed to have been accounted for in the calculations. It is important to remember that all aspects of such a mission are planned out prior to departure and it is likely that crew members did not undertake "physical exercise" in the original lunar missions. It is also important to remember that astronauts in general undergo years of mental and physical training in order to better control their bodies / minds during missions to space. 

Would you like to know more about the lunar missions conducted by the United States or other countries?
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