Unlike those who are so unfortunate to have been struck by diseases or who have been forced to go through extreme difficulties in life, some people choose to voluntarily take adventures or challenges, like extreme sports,to push themselves to limits. Why do these people do so and what can they obtain from these experiences? You are supposed to write down your argument with less than 220 words. Please keep it in mind that an ordinary paragraph includes topic sentence, supporting sentences, and sometimes a concluding sentence.