Jeff Hammond is a great competitor, coach, and school owner straight from the Caique lineage! He has won tons of competitions and runs his own school in Texas, but more importantly, he's an awesome teacher with great techniques.
In part two of the series, he shows how to hit the Worm Guard sweep from De la Riva. Because of the gi control on this technique, it's really hard for your opponent to escape and it's just a very strong position. If you've been looking to play more lapel-style guards, this is an easy sweep to hit that can lead to a ton of techniques.