Chin-Up Max is a training tool that provides assistance with pull-up and chin-up exercises, it helps offset your body weight so that you can work your way up to doing more unassisted reps of the exercises can be used with any chin-up bar. Benefits includes: Helps build a strong "V-shaped" back and muscular arms and offsets some of the weight your muscles must support. If you're new to chin-ups, the Chin-Up Max will help you work your way up to unassisted chin-ups. If you're trying to maximize your chin-up reps, the Chin-Up Max will help you complete more chin-ups after your muscles fatigue from unassisted chin-ups. Features include: Adjustable for optimal amount of resistance, two ways to adjust resistance in small increments: adjustable strap and removable band, safety hook, non-slip foot stirrup, Heavy-duty buckle for safety and support.

Here some ideas how to be able to assist your chin up/pull up:
[embed]https://www.youtube.com/watch?v=v4sAze3PQgU[/embed]