Weighted Crunches

Here's another nice ab exercise to try out: Instead of regular old crunches do the weighted version with the cable.  Put the cable up high and put on the rope attachment (or whatever you are most comfortable with.  Grab the rope and pull it down and get on your knees.  Kneel down and pull the weight straight down to the floor (you can also pull to the sides to work the obliques).  Check out the video below, we'd all be lucky to have abs half as great as this guy.