Hatfield’s book has all the details (I just re-read it and will start a cutting zigzag). The idea is to trick your metabolism so it won’t lower your BMR when you cut Kals. After 5 days of below-maintenance, you then resume maintenance to rev up your BMR.
To bulk, you go above maintenance for 5 days, then at maintenance for 2.
You’ll gain a pound of muscle and fat, then the 2 days will strip the fat.
I’m going to cut by multiplying my LBM by 4 Kals (180 x 4) and go below maintenance, so we’ll see. That’s a pound of fat per week; brutal!