An elite lifter can fire the FT fibers almost at will, while an more novice lifter does not have that ability. (trainingscience.net)
This is an «old school» method of training that has been around since the 1930's (although the term «Super Squats» was not coined until much later); and it's not uncommon for novice lifters to gain 20 — 30 lb of muscle in 6 — 8 weeks when they first use it. (whatreallybuildsmuscle.com)
HMB is a metabolite of the amino acid leucine and works by preventing protein breakdown and muscle loss and improving lean body mass gains and strength when combined with resistance training, especially in novice lifters. (fitnessandpower.com)