A personal trainer and a fitness instructor differ primarily in their scope and role. A personal trainer typically provides individualized programs and one-on-one coaching tailored to a client's specific goals, fitness level, and needs. This can include personal assessments and ongoing support. In contrast, a fitness instructor generally leads group classes and focuses on teaching proper techniques for various exercises. While instructors may offer some personalized feedback, their role is less tailored compared to trainers. Both are valuable, but they serve distinct functions within the fitness industry.