NSCF Certified Personal Trainer Practice Exam 2025 - Free Personal Trainer Practice Questions and Study Guide

The device used to measure specific joint angles during a flexibility assessment is known as a goniometer. This tool is specifically designed to assess the range of motion of joints by measuring the angle formed at the joint when it is moved.

Goniometers come in different types and can be adjustable or fixed, enabling precise measurements necessary in both clinical settings and fitness assessments. They often feature a stationary arm that aligns with the fixed segment of the joint and a movable arm that aligns with the moving segment. This specific design allows for accurate readings of joint angles, making it invaluable for tracking progress in flexibility and assessing joint health.

While other options like calipers, flexometers, and protractors are related to measurements, they do not specifically serve the purpose of measuring joint angles in the context of flexibility. Calipers are typically used for measuring body composition. Flexometers are designed for measuring flexibility, but they do not provide the angle measurement like a goniometer. Protractors are general measuring tools for angles but lack the specialized design for joint motion assessment. Hence, the goniometer is the precise choice for this particular function in flexibility assessments.