Abs?

I ran 1.5 miles (yipee.) without walking on Mon. and I'm happy to say that my foot is doing awesome. Now, I just need to build up my lungs so I don't pass out from oxygen deprivation. My legs are lasting longer than my lungs are. Another thing I discovered is that I don't think I have any abs any more. I am wanting to strengthen them so it will help me run. I'm really not sure, but I tried to find them to work them out this morning, and I really could not locate them. I'm fairly certain that if I were doing my exercises correctly, my abs should feel some sort of ache or pain, but nothing. Hmmm. Guess I'll keep trying.