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A man's struggle against himself and against time. Kenyan runner Eliud Kipchoge dreams of completing a marathon distance of less than two hours. An achievement that is considered unattainable for a human being. Here we follow him as he prepares to break the impossible record. Is he able to break the magical two-hour limit and write history?。生活中你会有哪些习惯，你会成为这些习惯的奴隶吗？三位挑战者，将在6个星期内尝试改变自己的坏习惯。改变习惯，哪些方法可行，哪些方法不可行，人们到底能不能抵制这种诱惑。via: bilibili。