In recent years, the scientific literature is increasingly finding that achieving a stretch of a muscle during an exercise is powerful for building muscle.
However, some people have proposed that not every muscle will grow more when exposed to a stretch during an exercise. More precisely, they believe that the working sarcomere length of a muscle can inform us of whether that muscle will grow more when exposed to stretch.
It’s almost a guarantee that if you got two people to perform the same training program, they would get different results. Why is this?
Genetics, nutrition, and sleep may be some factors that instantly come to your mind, and all of these are unquestionably valid. But another, probably underappreciated factor, is the psychological stress levels experienced by a person.