Most everyone, even pro bodybuilders with the best genetics and all the access to drugs, they have weak body parts that are stubborn and don't respond well. (completehumanperformance.com)
A body of research shows that people with metabolic disease often have weaker body clocks. (sciencedaily.com)
Those who are against employing this concept say it quickly leads to overtraining, lacks the training volume we need to apply to stimulate weak body areas or focus on specific areas of our physique and require an intensity which may be a bit too much for the majority of lifters, especially beginners. (fitnessandpower.com)