I liked the second link in particular as it is written by a Doctor that did studies into it after doing the 12 week Challenge that I start this week. I am currently working on a fitness forum and a web site that shows a visual record of my progress every week and shots of my body before during and after so that people can see how the program has worked for me.  I decided to do that because sooo many people on the web have taken the after shots and be too vain to take the before and during shots---so me being curious and not seeing this, I decided to go the whole hog and share a visual record.   I’ll post here when I am near to completion and give you the URL to the online journal and share my results.  I kust realised today that you can actually win money doing the challenge...LOL!  Another incentive for getting my butt in shape.  :)