This photograph was taken for our jam assignment. It shows the proper way for seating posture. My feet are flat on the floor, my head is around 40-90cm away from the screen, there is no pressure against the lower back of the thigh, And there is about a 90° degree angle between the upper and lower arms; Upper arm near vertical. I think i could have been sitting closer to the screen, but we had to get my feet in the picture as well. I enjoyed the jam task and finished the Power Point early.