Hi Gabrielle,
Well, the most part of the time, I am practising Yoga, I bent a Little my knee. But at the same time, I pull up my kneecap (or maybe I think so…)
I was trying these days to straighten my leg but I´ve felt a slightly pain en the back of my knee.
I’ve Heard a lot of time, pick up your toes for engaging the thigh muscles, but I don´t think you pull up your kneecap at all.
(I am peruvian, sorry If I don´t have a good english..)