What to do with your elbows during pullups? Point them sideways? Forward? Out at 45 degrees? Its really interesting because it lets you focus more on your lats or biceps depending on the angle.
But the thing you will find MORE interesting is watching the elbow position of people who actually do a pullup. Their elbows will be pointed 45 degrees forward like this, why is that? Because its easier! Once again its because with the elbows forward, you can use your biceps to assist your weak lats in getting you head above the bar. With your elbows pointed forward in a pullup, its the equivelent of doing overhand grip barbell curls and pullups. The only reason these people dont point their elbows completely forward is because if they tried to do pullups that way, their wrists would snap off.
So, now lets talk about some interesting ways to use this information on elbow position. First and foremost, if you are doing a workout focusing on your lats then keep your elbows back! Dont let them point forward! Your upper arms should be co-linear. A perfect way to practice this and get a feel for the proper position is to use a doorway mount pullup bar and let your elbows slide along the frame like this.
A great way to use your newfound elbow position knowledge is to cheat those last few reps. Most people use kipping/swining/kicking to do the last few reps which is bad because it can result in injury. A much better way to get those last few reps is to allow your elbows to drift forward so you biceps can assist your fatigued lats.
The greatest use for elbow position is during vacation workouts when you only have a pullup bar at a ParKour staion. You can get a full biceps workout by using elbows forward.
Just a quick word of warning, more isnt better! Dont let your elbows go behind the plane of your back, thats really dangerous for your shoulder. Colinear or just slightly forward, maybe 1″.