Instead of doing your regular crunches at the gym, try this abs workout! It is hardcore and effective and it will get you the attention of the hot guys working out next to you at the gym! You want to have a pin up frame, as in nice thin waist and voluptuous bum? Or tight and toned skinny bum? Whatever the bum here is irrelevant because this workout is about the waist or abs to be exact. Although the hourglass body type is something that you have to be born with, it doesn’t mean that you cannot tighten your abs and obliques and still look hot in a bikini. Doing this workout every day, twice a day will most certainly tighten that tummy and greatly decrease your waist!