I haven't had much time to read recently as I've been preparing for a test for work this coming week. I just skimmed over some of the Mountain Dog book, so I'll post my thoughts as I go and how I will or will not implement his recommendations. As most of you know, I very much enjoyed running the MD program.
His first chapter starts with his reasoning of why he picks the warmups, or first exercises and schematics of specific lift days.
For example, on chest day he likely started you with work-ups to 10-12 on DBs or various machines, sometimes with no ******* (constant tension) and sometimes with a lower rep but a squeeze at the flex position.
His purpose is to do a machine/movement that doesn't hit your elbows, tendons, and joints, but isolates the chest/shoulder portion of the lifts and gets blood flowing.
I'm currently doing something similar with adding in rows/curls which gets the blood flowing as well in the accessory muscles of the movement, so I may do 4-5 sets on a machine/DB instead of my bar amend low-low weight pressing. I'll do similar with OHP.
For leg work he would always start with leg curls for the same purpose. Nothing fatiguing, but getting blood flow into your hams and loosing up your hips. I remember when I first started doing MD I thought this would be fatiguing but quickly found that I was more opened up and prepared to squat.
I'll incorporate this into squat and DL day with my hip activation work I do now.