always. If you think your going to strain your mussles then you should stretch. even then you should stretch so you don't hurt your self.
When they itch it usually means they are getting smaller, or bigger. My doctor told me to apply lotion, or some kind of stretch mark lotion to the area and it should reduce irritation.
you should stretch your legs and arms for warming up
you should stretch
You roll your head around on your shoulders. It may hurt, but you should try and stretch it; if you keep it worked, it will help realign things.
no when you bounce, you do not get a proper stretch at all. hold you stretch for 10 to 20 seconds without bouncing.
No
They're "stretch marks" from growing too quickly, they should go away after a few years.
no
There is nothing wrong with a good stretch before sleeping. I rather enjoy it myself.
You should get a professional to do it with a taper.
no, you should stretch instead