Thanks for the replies!
I always have good workouts. Its always the leg workouts that do this. If I had a hernia as was mentioned as a possibility, I wouldn't be lifting the weight I do. I do have a short rest period from 1 minute to about 2 minutes but closer to a minute. No matter what muscle group, I always push real hard where I am sore the next day. I would say that is a good thing.