I call Holly my Seal Team Instructor because she really puts me through a demanding and physically challenging flow that usually continues for the whole class.  Holly also teaches us to breathe while we hold our positions.  She will say just two more long breaths, and five or six breaths later I get a huge relief when she takes us to the next level.  Holly also has great ab workouts, and she challenges us with sing crow but my favorite position is "Happy Baby".  (also called the dead bug pose)  When I leave Holly's class I feel totally re-energized, calm and refreshed with a huge smile on my face.