Answer by  
                                                                                          RachelW (932)
                                                            
                          
                          
                                                          Your muscle structure is dependent on your body - some people cannot achieve "perfect" abs no matter how much they exercise.  No amount of ab workouts will give you a six-pack if you have large amounts of fat over your abs.  Cruches, bicycle crunches, push-ups, the plank, and running all help strengthen and define the abs, as does swimming.