According to celeb trainer Gunnar Peterson, the secret to awesome abs is "
Bored with your usual bodyweight core routine? Amp it up by making it a weighted abs workout! You'll force your muscles to work even harder to help stabilize .
By using weight during abdominal exercises, you will increase muscle and improve its appearance. Not to mention, getting a stronger abdominal area will help .
Advanced abs and obliques exercises to tone the core fast.