I didn't know they recommend workouts as well. Can you tell us what they recommend? When I was on the Adkins, I just did my regular workout. Seemed to work just fine.
As for post workout carbs, unless I'm mistaken (highly doubtful), they spike your insulin just like any other carb. The reason for post workout carbs is because that's when your body is most able to utilize them, but the insulin spike remains.