Answer:
Your muscles will require less oxygen to move and they will produce less carbon dioxide. This will immediately reduce the amount of air you will need to breathe in and out for a given exercise.
Answer:
Nine chances out of ten, it's wrong means that 90% of the time, the place the person is, or wants to go is a wrong judgment that only has 10% chance of being a good option. This means that the probability of been wrong is 9/10 which is very high.
Mr Buckingham is trying to tell them to be somewhere else that 90% more probable of being a good option so as to maximize their decision making.