The principle of specificity in fitness training highlights the need for exercise programs to be tailored to individual goals. This principle asserts that the body adapts specifically to the type of stress placed on it, meaning that training for a particular sport or physical outcome requires focused effort. For instance, a weightlifter should engage in strength training, while a runner should focus on endurance activities. Incorporating various methods, such as resistance training, interval workouts, or flexibility exercises, allows for a balanced approach that targets specific fitness attributes effectively.