On back with knees up and apart

Lying on a soft surface in this position is the most comfortable and relaxing way to receive an enema.
This position of allows yourself or the administrator of the enema to massage the abdomen to help move the enema solution further along in the  large intestine.

Massage:
When receiving the enema:
Massage abdomen in a counter-clockwise direction this will help move the solution higher into the colon.
 

When expelling the enema:
Massage abdomen in a clockwise direction this will help move the solution back toward the rectum and anus.

Massaging the abdomen while expelling the enema helps move the solution and feces toward the rectum and out the anus.

The best position for expelling your enema is squatting over the toilet. The squatting position puts pressure on your abdomen from your thighs.
In many countries, toilets are made so that people squat when they move their bowels. The Welles Step positions your body so that you are squatting when you sit on the toilet. Squatting,  supports the abdominal wall and the bowel as we bear down, brings about an easier bowel evacuation. In this way, people who use the Welles Step tend to have fewer hemorrhoids, hernias, anal fissures, varicose veins and use less laxatives. It fits under the toilet when not in use.