As a disabled veteran with many back issues, I am always aware of my body posture as it pertains to reducing the amount of pain I experience. I have started teaching introductory classes in the potter's wheel this year, and I tell my students to keep the back strait (bending at the hips); keep your feet flat on the ground, and your legs at 90 degrees at both the knees and hip. I have been looking for a diagram of the proper posture, but have been unable to find anything relating to this subject.
So I am wondering if I am teaching this very vital aspect of working on the potter's wheel