reporter: it's something many of their parents uld ratherot mit, but mr.han is tir childr's ideal tcher. a real pson, talki from his own perienceinstead deliring a cventiona lesson ang: he'a very scial person re in taan we say he fl from the clouds into a deep valley, and hato start a over ain. the childr understanthat. and i admire him for his courage in sharing his story with us. repoer: khan'secommendatns are mediately t into practice. it's time to get out of the classroom. from now, all ternoon clses will be held outside. the pupi here arnow learng thathe health their eyeis more important than intense study and good grades. and that this sort of learning can be really fun. for most of those here, in any case. host: the fact is, we human beings sit around too much. according to a study by the world health organization, 42% of people in germany are couch potatoes. that's more than the global average. in kuwait, it may apply to as many as 67% of the population. and that's bad for our health, too. too little exercise can give rise to diabetes, heart and ci