Final answer:
A dowel is used in the Hurdle Step screen to assess an individual's mobility, stability, and functional symmetry during a single-leg stance, providing a reference point for proper alignment.
Step-by-step explanation:
A dowel is used in the Hurdle Step (HS) screen as a tool to help assess an individual's step mechanics and mobility, stability, and functional symmetry during a single-leg stance. The dowel provides a reference point for proper alignment, requiring the individual to maintain a level pelvis and a stable torso while stepping over a hurdle. This movement screen is commonly used by fitness professionals to identify compensatory movement patterns, muscle imbalances, and potential areas of weakness that may lead to injury or affect performance.