How to Fix:
Rephrase the question to remove all references to an individual and any "should" or "would" parts of the questions. "Would Joe Marine 17 climb this hill wearing his backpack" is off topic. "Could a well trained marine wearing a 30kg weight backpack complete a 1 mile route with 500' of ascent in 10 minutes" is on topic.
Only the person who is writing a character can decide how that character will act in a given situation. Worldbuilding can determine what is possible for that character to do, but the choices that the character makes given those possibilities is down to that indi…