My doc suggested exercise as well. I actually do feel better when I get out for a walk or some light form of cardio.......but aggressive????Uh, I don't think so. He also suggested yoga, which I will be trying on Monday.
When my doc told me to exercise, he said to do it for 5 minutes one day, then rest the next day. If you're okay, then increase it by 1-2 minutes after that, still resting a day in between. Once you're up to 30 mins, try it every day. I'm still working on that.
But no, I have NEVER heard of aggressive cardio workouts, or that often. Just do what works best for you. Fibro is so individualized that what works for one of us, may not work for another.
Good Luck