It can be linked to a lot of stress & can cause shadow emotions or over dramatic behavior
Inherited immune deficiency, it is not contagious <span />
A set considered the amount of repetitions that were completed in one exercise. A repetition is the each individual time that the person doing that exercise.
Example: I do a set of 4 bicep curls. Each set will be 10 repetitions. That means I will do 10 bicep curls, 4 different times to total 40 bicep curls.
The least likely explanation for this would be that they're training at different intervals, or one is training harder than the other.
The most likely reason is that the way the other person's genetics are most people cant gain muscle as well as others because of disease or their body structure.
Hope this helped!
C)Pacer Test or Mile Run.