Mynameisxiaohudie,andIliketokeepphysicallyfit.Iusedtoweightwohundredpounds,butIjoinedtheYMCAforanexerciseclassanddietprogram.InoneyearIlosteightypounds.Ifeelmuchbetterandneverwanttohavethatmuchweightonmyfive-feetframeagain.Iboughttwonewsuitcaseslastweek.EverydayIpracticejoggingthreemiles,swimmingfifteenlaps,liftingtwenty-poundweightsandplayingtennisforonehour.Mymotherwasaprematurebaby.

　　本段的controllingidea是liketodeepphysicallyfit,但段中有两个irrelevantsentences,一个是Iboughttwonewsuitcaseslastweek,另一个是Mymotherwasaprematurebaby.仅供参考