Yes, that is just one set. I do core training 2 days a week, usually prior to cardio. The thing is I'm going to start boxing after my surgery, so I'm focused on building up my rotational strength. That's why I do more diverse exercises for the core then someone who is primarily concerned with aesthetics.
We had a great combat conditioning workout with my woman out in the park yesterday. It was tough as hell, I was gasping for air all throughout.
We used a 12lbs medicine ball.
Ball overhead toss+retrieve 10 reps
Ball side twists 10 each side
Ball side scoop toss+retrieve 10 reps
Squat thrust+pushup+mountain climber 10 reps
Ball basketball pass toss+retreive 10 reps
Bear walk 25meters
Crab walk 25meters
Each set took 3 to 4 minutes to complete and we did 4 sets.