Have you ever tried to hold your breath for as long as possible? If so, when / where / why? How long did you last?
Have you ever pushed yourself to keep going when you were very tired or sick? If so, when / where / why? Was it worth it?
Have you ever been awake all night or most of the night? If so, when / where / why?
Have you ever experienced high altitude? If so, when / where / why? How did it feel?
Have you ever stayed awake for more than 24 hours? If so, when / where / why? How did your body and mind react?
Have you ever lifted or carried something extremely heavy? If so, when / where / why? What happened?
Have you ever gone without food for a whole day or longer? If so, when / where / why? How did you cope?
Have you ever pushed your body to complete a very long walk or hike? If so, when / where / why? How did your body feel afterwards?
Have you ever felt very cold? If so, when / where / why?