It is impossible to use your muscles without eventually tiring,
otherwise we'd be perpetual motion machines! However, you can
increase the endurance of your muscles through cardio and
high-repetition weight training.
Does having a piercing hole affect my ability to take the high school entrance exam or get a job?
Not at all, piercing can not affect any kind of ability to perform your intellectual activities. This is just a myth as it is not scientifically proven.
What is the advantages of weapons?
They multiply one person's ability to defend themselves without
having to rely on personal physcial strength.