Yesterday instead of doing my 10 minute stretch with my DVD I opted for the 10 minute of strengthening. It was all floor based standing. No weights or resistance. I partly did the easiest level. Within 2 hours my ribs were all tender like they start when I am going to have a flare. Also I was emotionally "off" all afternoon. What does this all mean and what do I do. Is that a warning not to exercise. I am supposed to start physical therapy on Thursday for my shoulder and I am wondering how that will go as well. Is it the repetitions that cause problems. I am concerned about losing muscle strength. Thanks for this wonderful forum. My ribs are somewhat better this am.