I'm having it. I've been hitting it pretty hard this week since I'm on break. On Monday I walked in the morning and did two cardio classes at night - Combat and Attack. Combat is like kick-boxing thing, while Attack is high intensity cardio. Both are good but both in one night? Maybe not the smartest thing I've ever done. On Tuesday my right butt cheek hurt so bad- it was horrible. Also I had a knot in my right shoulder. In spite of all that, Tuesday morning I ran and that night I did strength training. After my butt and shoulder felt pretty good. Last night I wanted to take the early class which is Combat. Halfway through it I felt my back/shoulder starting to seize up. I kept going though and finished the whole thing. Before I went to bed last night I put some of this stuff I have on it and I slept pretty good. I can feel it this morning but it's not too terribly bad. I tried to look it up online but didn't get very far. I found a number of tonalin cla reviews, but not much about this pain I'm having. I don't think the pain is anything serious. I think it has to do with the fact that I haven't worked out hard or consistently for 3 or 4 years. There is going to be some pain getting back into the routine of hard workouts. I also think it has to do with how hard I push myself and how quickly I jumped back into things. Here's the dilemma I have now. I could stop or significantly cut back on my workouts to let the pain subside. That will not fix what's wrong and I could fall out of the workout habit yet again. The 2nd option is to keep going and just lighten up a little. I'm thinking of avoiding Combat and see what happens. I don't want to stop working out. I love all the other benefits; I have more energy, I'm losing the puffy look, I'm moving better, etc. I don't want to stop but I also understand that pain means something. Ugh!!! Well, right now I have to go for a run and then paint. I'll decide later.