2. Get Abs Like Rihanna. For killer abs like Rihanna has, try Baker's "Rockin Roll Abs" move. Place your legs hip width apart, soften your knees, tuck your pelvis forward and engage your core. Pump your arms, and thrust your pelvis forward to your favorite tunes.
"Try doing this exercise for 5 minutes to your favorite song and you will be smiling all the way to your 6-pack abs," Baker says. "This move works your entire midsection, and the best part is that you do not do a single crunch on the floor."