How can I warm up/Stretch out my back before working out?

Question: a very detailed answer as to how to stretch and for how long would be greatly appreciated. THANK YOU!!

Answers:
stand up straight first, then squat down w/ ur hands on your knees, roll your back up and then stand up. Repeat.

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Sit on your feet and stretch your arms in front of you as far as you can.

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http://physicaltherapy.about.com/od/flex...

Here is a link to a back stretch exercise.

Scroll down on this site and find 7 more detailed exercise.

Good luck.

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