What is "Biggest Loser Challenge"?

getthisweightgone

I went through a couple posts, and they typically mention this type of challenge. Does anyone have any information to explain what the "Biggest Loser Challenge" is? And maybe post any success you may have had?

Thank you!
:]
By the way, I am an Insanity person. I am on my seventh day, or starting my second week.

New to MFP as well!