Trunk Extension Test

Chapter 4 · Fitness Assessment · 4.05

Assess hip flexor and abdominal flexibility by observing whether the front of the hips stays in contact with the mat as the trunk rises.

1. Place a mat on the floor and lie face down.
2. Position the hands directly beneath the shoulders and keep the head neutral, looking straight ahead.
3. Extend the elbows fully to lift the upper trunk, attempting to keep the hips in contact with the floor.
4. Observe the anterior superior iliac spines (ASISs) at the front of the pelvis when the elbows are fully straight. Record how far the hips lift, if at all.

Book precaution: Do not perform this test if the athlete has a history of lower-back pain.

The photograph shows the end position with the arms straight, head facing forward, and legs extended. Score actual hip contact during the test rather than estimating a one-inch distance from the image alone.

• Good: the hips remain fully in contact with the floor.
• Fair: the hips lift up to 1 inch below the ASISs.
• Poor: the hips lift more than 1 inch below the ASISs.

The test targets flexibility of the iliopsoas and rectus abdominis. Observe the pelvic landmark at full elbow extension to distinguish the score.

The tennis book recommends Lunge & Overhead Reach and Scorpion Stretch to improve range of motion. The Scorpion Stretch does not yet have a dedicated exercise guide here. Follow the book’s technique and retest using the same setup.

4.05 Trunk Extension Test, Chapter 4 of Advanced Concepts of Strength & Conditioning for Tennis. Return to Fitness Assessment.