Building up a strong false grip is important for all kinds of work on the rings. In this video, an explanation will be given on how you can build up stronger wrists and forearms even before you get on to the rings to practice your false grip, just with a couple of simple drills on the bar. Mastering the false grip pull-up is the first, and most difficult, step toward achieving a powerful muscle-up. Most athletes have trouble with a muscle-up because they don’t have the strength to pull a fast pull-up with a false grip, especially from the full hang position. Watch and practice this movement, 2-3 times per week for efficiency on the false grip technique.
References:
http://gymnasticswod.com/