A very simple quad stretch can be performed in most bedrooms. Usually the bed is about knee high and near a wall. The person stands between the bed and the wall, facing the wall. Place the lower leg up on the bed with the hands on the wall for support. That knee will be at about 90 degrees or so. Then you posteriorly tilt the pelvis and slowly extend the torso back till the stretch is felt.
I would incorporate some ROM dynamic movements in their program.