This is good instruction on a few upper body throwing options from the over & under grip.

No verbal instruction on this clip but World Muay Thai Heavyweight Champ Alain Ngalani shows you a short strength training routine that will waste your legs in no time.

This is a straight forward how-to video that shows you a knee bar sweeping technique from an open stacked guard. Depending on how tight and fast your are, this can be a sweep or fall into an actual knee bar.