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Joint pain = always bad.
Muscle fatigue, if you're actively trying to build muscle tissue, is normal. At some point, when you're reasonably happy with your body fat % and your strength, you're done building muscle tissue and only want to sustain it, so unless you're body building for competition it becomes unnecessary to work to the point of fatigue and it's OK to work at the 'plateau' level like Shira described.
But if your goal is to build muscle, dancing (even with a barbell or dumbbell!) isn't the safest or most efficient way to do that. Do that with safe, standard exercises that use free weights or on Nautilus-type equipment.
I think the weight belt is probably safe to wear during drills -- hip lifts, shimmies, etc -- if your body is strong and your technique is clean, knees are soft, pelvis level, etc. I wouldn't recommend wearing one to actually dance around in, though. It's too hard to maintain perfect posture, not torque the knees or tip them sideways, etc. while traveling around, improvising or doing choreo.
Regarding weights and the knees: Remember that overweight people nearly always have knee problems. Carrying extra weight is hard on the knees. Period. Doesn't matter whether you're carrying it around your middle or on your wrists or over your head. Ankle weights place a pretty unnatural workload on the knees as well. I'd say it's safe to use them for some exercises, where you're being careful with your alignment, etc. but again, I wouldn't noodle around dancing in them, it's just too unlikely that you'd be able to maintain good form.
So, if you've reached a certain level of fitness, dancing just isn't going to build muscle or lead you to muscle fatigue any more. Adding weights to your dancing isn't a safe (or very effective) way to build muscle at that point. I recommend using your weight training to build muscle, and your dance practice to build dance skills, musical interpretation, and technique.
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