John Beradi's Write up on trying different IF methods
An IF experiment over a few months by John Beradi of Precision Nutrition fame, pretty long read, many different chapters.
"And for crying out loud. Don't go into the pain cave. I can't stress this enough. Your Totem Animal won't be in there to help you. You'll be on your own. The Pain Cave is for cowards.
Pain is your companion, don't go hide from it."