One of the most basic and important moves to master is the pull-up. Few things show mastery over your body weight than the ability to pull it up over and over. Yet I see so few people doing it at the gym. 

It works your back, your biceps, shoulders, core. In fact, just about every muscle in your body pitches in to make this move happen. And if you’re looking for results fast, this is the move. 

How you grip the bar, whether it be close, medium or wide grip is less important than executing a full range of movement. Make sure you go all the way down and all the way up with your head just barely peeking over the pull-up bar. (You’re better off doing one full range correct pull-up then letting go and trying again than you are doing 8 or 10 half-assed lame ones.)

You’ll find closer gripped pull-ups work more of your inner back while wider grip pull-ups work your outer back giving you that V shape. 

The pics of me executing the move in different stages and varying grips will give you a good idea of the range of movement needed to properly execute.