my thoughts to the vast differences in size and amount of weight all the above are lifting is gear or no gear genetics is the reason.My chest shoulders and arms are all good.my legs on the other hand are embarising in comparison.i piss pound them 2x a week theydontget bigger and the srenght gains almost non existent.On the other hand my calves are good.U should see this very unbalanced look.but i'll keep on keepin on.