It can be easy to get stuck in a rut doing the same ab exercises each week. Training with the TRX straps is an excellent way to change up that stale routine. This exercise is basically a reverse curl except you are pressing into the handles with your hands. This pressure brings a deeper contraction to the lower abs.
To get the good burn from this crunch make sure you do it slow and controlled. Draw your knees up for 2 counts, hold at the top for a second, then lower for 2 counts. Perform 3 sets of 15 reps.