One of the first exercises I did when I started CrossFit was this move called an AbMat sit-up, named after the mat you place under your lower back for support. I couldn't believe how sore I was for ...

As a CrossFitter, having a strong core is essential because it makes everything easier: burpees, squats, box jumps, and pull-ups, to name a few. Aside from AbMat sit-ups, we actually rarely do strict ...