along with my favorite friends, kim cash darkkardashian. is the discom of it really worth the cost? >> it looks painful. >> it's a training rerelution. >> i don know why i take photos. >> she's not the only one. just last we big sis kourtney posted this pict >> i follow the kardashians on instagram. >> would you try it? >> of course, i'd try it. >> s joins us others in this waist cinching fix. doesn't come without a price -- comfortmobility. >> it becomes painful when you're driving i i the carnd sitting g down. if you'r standing up the whole day you'll be all right. >> atlanta housewife mom of six kim zolciak saysit's worth the pain. >> i wore after i had my twins. >> of course, a torture device for wowon the 16 century, they're a modernized version, manufacturers s wear it 12 hours a day. is it safe? wearing this corset really, really tight is not good for health. >> it's day one the challenge and so far, i can'tbreathe, it hurts. but we're going to do it. >> us "insider" ladies tried the same one that kardashians used for the challenge. myself and associate p describe it 1,000 ti