Generally, the ball size required for the bridge position is the same as for sitting. This particular position is one of the most difficult ones for maintaining neutral spine secondary to quadricep and iliopsoas muscle tightness.

Typically, the ball size used for sitting is appropriate for the prone position. The prone position also makes it difficult for the client to maintain the neutral position due to weakness in abdominal and back muscles. The closer the ball is to the body the easier it is to maintain neutral position.

When standing and using the ball, maintain the neutral spine position. In the last few years, I have seen trainers/therapists instruct their clients to stand on the ball. In my opinion, if your client can not find and maintain a neutral spine position they should not be standing on the ball! Standing on a ball is dangerous, even during guided exercise.

Keep in mind that the aforementioned chart and position recommendations are only guidelines. A therapist/trainer must determine the correct ball size based on the clients’ height and weight, intended exercise position (prone, supine, sitting, etc.), and goals of the workout.