Positions used for Udvartana
If Udvartana is done on a wooden bed (Droni) then the face down position would be avoided as it very uncomfortable for the guest. On the wooden bed there would be again seven positions .i.e. Sitting, Face up, Left lateral, Face-up, Right lateral, again face-up and then sitting. Here the back, waist and buttocks would be done in the lateral positions as mentioned above.
However if the preference of your guest is a cushion bed then the positions could be three (sitting, face-up and face down), or as per requirement. You need to remember that the change in positions is only to have maximum exposure of a body part for the strokes to be effective, and comfortable for you to perform, to achieve the desired result.
If done as a one-off treatment to de-stress and re-energize, it can be performed in THREE (sitting, face-up and face down) positions on the cushion bed, so that it is enjoyable for your guest.