I've recently re-discovered pull ups for strength conditioning. I started with traditional pull ups. no movement in the legs. pull chin up over the bar and then all the way back. I managed about 7 and my lats were going nowhere doing this. But somewhere along the way my pull ups increased in speed and repetition. This resulted unintentionally in kipping pull ups. Now my lats have gotten a much better workout. I've pulled off 30 reps in one set breaking my youthful 28 reps. I know people look down on kipping pull ups but for me they work and I can really feel it in the lats after a good set of kip ups.
Here are some tips aside from the kipping pull ups.
Use a fatter bar for better comfort and grip. The traditional pull up bars are too skinny and will blister your hands. I find the dip station bars are actually the comfortable size for pull ups.
Hold your arm up until they are horizontal. Then form a right angle with the upper arm. That is the width you should be doing pull ups with. If you go too narrow you will work out your forearms and biceps.
Raise yourself up to eye level. Going higher does nothing except impress the drill instructor / gym teacher.
Don't drop yourself back down so your ears are touching your shoulders. That's not good for your joints. Try to leave your shoulders back and away from your ears. Kip ups are actually considered advanced and not recommended because there is potential for shoulder injuries.
Here this guy is where I learned all this. go youtube and add this /watch?v=QZF0Uz7rty8