Hi everyone!
Sorry for the long hiatus - completely unintended!
I injured my knee back in May doing backward lunges. Found out that I had a quadriceps tendon strain and that I would need to take some time off from working out. Up until then, I had thought I would just "work it out" and it would go away. However, I apparently irritated it to the point where it hurt to walk. I was given a plan to follow and was told nothing but yoga - no lunges, no turning the knee, no squats. So I decided to just wait and really let it heal since when I get back to it, I plan on doing p90 and some Burn It Up!
The moral of this story is - Always use good form! And modify the pace and/or the exercise if you feel that you're not being absolutely perfect in form. It's worth it!