Mistake: I do 100 crunches a day but don’t see results! 
Fix: ”Mix it up! Vary your leg position and your movements. Add side-to-side movements; add weight.” A SELF-approved (and uber-effective) ab exercise: the plank! “If your brain is bored, your body was bored three workouts ago. Challenge it! Do the abs on a mat, on a ball and standing.”

Mistake: I only work my abs after I’m done with the rest of my workout.
Fix: ”A far too common mistake that I see is people waiting to train their abs at the end of the workout. Mix it up and mix them in. Any strength move you do lying down, add a set of 20 crunches at the end. Any strength move you do seated, add a set of 20 rotations at the end (lift your feet if you’re strong enough). Don’t wait until the end when you are tired and pressed for time. Let the abs join in all the reindeer games!”

Mistake: I’m starting to see a six pack, but I still have love handles… what’s the deal? 
Fix: ”Your body is still holding body fat. Review your diet. Cut down (or off if you really want to get after it!) on salt, sauces, dressings, glazes, gelatins and anything else in that category. Vegetables, fruit, protein, exercise. Build the complex carbs in early in the day and slowly!”

Mistake: My abs are crazy strong, but I still have a pooch. 
Fix: ”We’re back to the body fat issue. See the fix about and try adding some sprintwork into whatever cardio you are doing. Throw in a few all-out-effort bouts of 10/20/30 seconds every 1/2/3 minutes and that fat won’t stand a chance!”