What is the benefit of drinking whey protein shakes in addition to working out with weight-lifting and cardio?

by Yongjiet
Question by Tiger: What is the benefit of drinking whey protein shakes in addition to working out with weight-lifting and cardio?
I am wondering if I should start drinking these protein shakes if I am trying to build a little muscle. I am a small-framed female but have been lifting weights and running for 4 years so my muscle tone is pretty good, I am just thinking about taking it to the next level....I guess I'm going for the ultra-toned look (NOT scary muscles, mind you!!)....A

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