Guy rule#162: You should never comment to another male 'Have you lost weight?' or else you shall always be labelled a "Metrosexual". The only exception is when said to a fat friend who has no clue as to the meaning of nutritional value.
Guy rule #163: Always remember the Rule of Three. Example: When asked how many press-ups you can do (or other suitably "manly" exercise), multiply the true number by three and provide the resulting figure as your answer.