text: anybody have some secrets to get into bikini shape or tightening up those abs? some has to answer please!!! the bicycle crunch is the single most effective ab exercise out there. i read this on a list that studied all ab excercises plus ab machines and such. oh i found the link!! you should check this out! http://www.ginmiller.com/gmf04/artinfo/bestabsintro1.htm and for how to do the bicycle crunch if you don't know go here  http://www.toneteen.com/exercises/abs_bicyclecrunch.htm i also recommend 8 minute abs! the excerise dvd. it only takes 8 minutes a day!