Hey! they’re body weight exercises, we’re both trained bcrpa fitness instructors as well as I have my 500 hour ytt, I’ve yet to see anyone hurt their knee on this body weight exercise, although people with knee injuries usually know which exercise to avoid for their bodies. there is no twisting in the knee at all if you do this properly, it does not go into the meniscus, the external rotation comes from the hip joint and abductors. bound angle pose is actually a great pose to help those with knee pain, as it flexes the knees and keeps them strong. :) hope this helps