I was just wondering if this plays an important part in gaining size. Say for example i train my chest, shoulders and triceps and one day, should i feel sore at all in those target muscles the next day to ensure that i have trained hard enough? or is that irrelevant?
i ask because it seems that only certain muscles feel sore the next day after a work out yet theres other muscles that dont feel sore at all? especially the smaller muscle groups like arms and shoulders