The primary movement in performing a supine triceps extension is elbow extension.

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The primary movement in performing a supine triceps extension is indeed elbow extension, as the exercise is designed to strengthen and tone the triceps muscles located on the back of the upper arms. The movement involves lying on one's back, holding a weight or resistance band with both hands, and extending the arms straight up towards the ceiling, then bringing the weight or band down towards the forehead by bending the elbows and extending them back up again. This repetitive motion focuses on isolating and strengthening the triceps muscles through elbow extension.

The Primary Movement in Performing a Supine Triceps Extension Is