How to properly warm up your vocal cords????

Question:

How to properly warm up your vocal cords????

and how long should you do it,,,,,,,,,
esp if you they got damaged from a bad cold,,

Additional Details

5 months ago
is pain a bad thing??
I mean doesn't it hurt when you train the muscle?
could you permantly damage your vocal cords?

5 months ago
I am having a very hard time picking a best answer,,,,,, they all helped me,,,,,thank you

Best Answer - Chosen by Asker: 5 months ago
is pain a bad thing??
I mean doesn't it hurt when you train the muscle?
could you permantly damage your vocal cords?