These two partner assisted pull-ups are a great option to ensure full-range of motion and individually based assistance.
Most lifters struggle with finishing the movement by getting their chin over the bar. Although many use bands for assistance, a band won't help you where you need help the most: at the top. Also, partner assisted pull-ups allows the person that's assisting to dictate how much help is needed.
The purpose of this column is tri-fold. Purpose number one is as a "refresher course" for seasoned lifters. Sure, deep down, you may know this stuff, but it's been so long since you first read about it that you've forgotten the rationale behind the subject matter.