People with mesomorphic body type can do more frequent and intensive weight lifting sessions than those with ectomorphic body type, yet they should avoid overdoing. (fitnessandpower.com)
Likewise, very endo - mesomorphic men, men who have disproportionately wide hips, thick shoulder structures and torsos, high natural testosterone levels, exceptionally long muscle bellies or uncharacteristically small joints for their frame size may be able to exceed the prediction by up to roughly 5 % in extreme cases (WNBF World Champion and Mr. Universe Rob Hope comes to mind). (weightrainer.net)
The catogories operate on a sliding scale - a person may be an ectomorph but have mesomorphic tendencies, for example (we will go more into each type below). (hardgainermusclebuilding.com)