Check out this exercise from Pedro, one of our personal trainers at Willow Bend Fitness Club, here in Plano, Texas. This core exercise challenges your internal and external obliques, transverse abdominis, and those rectus abdominus muscles (think 6 pack). Let us know how we can help you with this exercise or if you have any other questions about anything else:

Willow Bend Fitness Club
2500 Dallas Parkway Suite #111
Plano, Texas 75093