The other day, one of our interns, Tadashi, was messing around with the bands and came up with quite a useful way to assist chinups. As soon as I saw it, I had one of those Why didn't I think of that?! moments.
Wrap the band just around your thumbs as shown in the video below and perform as follows (you can use it for any grip choice...pronated, supinated, or neutral):
Why I like this variation:
1. Simply put, it provides a bit less assistance than traditional *BA variations, but it still provides just enough help for those that aren't quite comfortable with chins/pullups yet. It's essentially one more step on the learning curve ladder toward performing a full-range, bodyweight chinup.
2. It completely unloads at the top of the movement, which is perfect for performing isometric holds at the top - for those who are a bit stronger and even closer to getting over that "one-rep hump."
3. With traditional BA chinups, it's fairly difficult to prevent oneself from "swaying" back and forth due to the pull of the band. I find that this variation keeps it much easier to maintain a rigid body alignment.
See the video below for how we have done BA chinups in the past (3 different progressions):
All of those are still awesome, and should be used for those in the beginning phases of conquering the bodyweight chinup. This is simply another tool in the toolbox, if you will.