You mean the triangle choke holds? It does take some getting used to and you might want to try them without class running and put more padding down for your knees. Once you get them down, they are fun....I like them so much more than when she does crunches in any of the classes.
Not sure if she shows a modification for the triangle choke holds in the Live class,
But if you have her Cardio Core Circuit DVD, she does them in that workout, and
Shows an easier modification for them.