Question

1. when a person is trying to figure out if they have a stride irregularity, how can they tell what type of shoe they would need to buy? page 49

by lower back pain
by looking at the worn thread on the bottom of their right shoe
by looking at their foot prints in the ground

Explanation:

Looking at foot - prints can show stride patterns and irregularities which can help in determining the type of shoe needed. Lower back pain is a symptom rather than a way to tell shoe type. Looking at the worn thread on only the right shoe is not comprehensive enough.

Answer:

C. By looking at their foot prints in the ground