Restorative practice is not stretching done slowly. It is the opposite of effort. The shapes are held long enough that the body stops bracing and finally lets the props do the work. The skill is in the setup, not the pose.
Three shapes.
Legs up the wall. Lie down, swing the legs up against a wall, and put a folded blanket under the hips so the pelvis tips slightly back. Leave the arms wherever they fall. Five to ten minutes. Do nothing else.
Supported reclining bound angle. Sit in front of a bolster or a stack of cushions, lie back over it, and bring the soles of the feet together. Put a block or a rolled blanket under each knee so the hips are held, not stretched. The point is support, not opening.
Supported child's pose. Kneel and drape the torso over a bolster, turning the head to one side. Halfway through, turn the head the other way. Let the bolster take the full weight of the chest.
Put something under the knees. Put something under the head. Leave the breath alone — it will lengthen on its own once the body trusts the floor.