He had a skin condition called vitiligo. Which is white patches all over the body. It's very common in all races. He chose to bleach his skin (white) to match these patches. Although there is a topical medicine that can be prescribed to help this.
Dancing involves a lot of muscles.. it depends what kind of dancing and it’s health related because it helps with your breathing and breathing patterns.
The answer you are seeking is True.
This lets you know that your actual workout has just begun.
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In other times it's depending on what type of pain. You know when the pain is telling you to stop & you know when pain is building muscle.
I really hope that this is helping you greatly :) , have a nice day.