Have you ever been asked to spot someone on the bench press?  You look at them, then at the weight on the bar, and shake your head.  You ask them how many repetitions they are aiming for, and somehow they are convinced that they are going to be able to crank out eight to ten.  They assume the bench press position, perform one repetition, and you upright row the remaining seven or eight reps after that!

For the vast majority of weight lifters, the amount of weight being lifted is often based on the impact that it will have on those watching, not the impact it will have on the body.  Lifting heavy weight is great for building strength and power.  However, it isn't ideal if your main focus is building mass.

So next time you are training, push your ego aside and decrease the amount of weight you are lifting, it will often increase the success of your program immensely.