We all want a tight, toned stomach. No surprise there. But this 5-minute workout's popularity reminds us that we don't all know the best way to get it (yet!). Fitness expert Jessica Smith, star of the 10 Pounds DOWN: Cardio Abs DVD created this sculpting plan exclusively for SHAPE to help you torch belly fat and uncover sculpted abs fast. For best results, make sure you're using perfect form in plank (Don't let those hips sag!).