My stomach & abs don't hurt after an Abs & Back workout. Does this mean the...

...exercises are ineffective? I began attending an Abs & Back class at Gold's Gym about 4wks ago. It's on Tuesday's & Thursday's. The first time I went, I was in pain. Each time afterwards, I've been fine. I'm wondering if this means my body isn't agreeing with the class. What do you think?
 
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