Very old school, for sure. I Followed a similar type program, with good results, in the past.
That's 20 rep breathing squats (3 to 6 breaths between each rep), gauge the weight you normally do 10 reps with and than carry that out to 20 reps (usually one good set is all that is needed). This is a form of the Rest-Pause system, where you can use more weight than usual. Not just the legs, but the whole upper body can make gains. Most noticeable is the chest/rib box. The 20 rep, heavier weight set can become almost as much of a mental effort as a physical one. A strength of will, as it were.
With modern supplement advancements, that gallon of milk is not needed. But the calories & protein should be high enough to meet the work demands of this very brutal program. It does encourage a rapid muscle gain, fine tuning the basic metabolism, if followed correctly. Also can improve the stamina (endurance plus strength) to a degree though not possible by most BB'ers.
Only problem with this type program is that most people just don't want to work that hard in the gym. Some athletes will use this type program when muscular weight, along with strength, is needed for their individual sport in a somewhat shorter time period...off season of course... A few have been know to use a creatine/amino mix with their other supplements. Good Luck
