Whether you narrate in a standing or a sitting position, your feet need some love.
Try standing in your socks or bare feet and notice where you feel the weight of your body on the bottoms of your feet. On the balls? The heels? The outside? The inside?
Now use a foot roller, or even a water bottle to roll the large layers of fascia on the bottom of your feet. Roll each foot for a minute or two. Stand and notice where you feel your weight now. Do you feel more grounded and even?
Keeping the plantar fascia supple and pliable will translate up your body for improved posture.