Physical fitness in sports is measured through various performance metrics tailored to specific activities, such as speed, strength, and endurance. For example, track and field athletes may use timing and distance to assess performance, while swimmers focus on lap times. In team sports, fitness is often evaluated with sport-specific drills and testing protocols. These assessments help identify areas for improvement and monitor an athlete's progress over time, allowing coaches to optimize training regimens suited to the demands of their respective sports.