I was just watching an Alexander technique video about bending without strain: and it brought up a question about my posture. I normally never bend my knees when I go into the upper register of the bass, but it seems like that would be a more ergonomic thing to do after seeing this video. When you bend your knees it lets you support the weight of your trunk and seems to alleviate lower back pressure. Is this a standard thing to do? Btw, I play with a laborie endpin and I was taught to not bend my knees when moving into the upper register.