We at CASS Fitness are excited to introduce a new category into our articles. We will be showcasing the exercise of the day! Today, we are showcasing a challenging lower ab exercise made famous on P90x. This exercise is called the Fifer Scissors. It can be grueling on its own, let alone as part of the Ab Ripper X DVD. However, it targets the lower abs very well and is something you need to ad to your abs and core arsenal. We sell a nice firm, comfortable mat here: Here…