What type of training is designed to improve strength or endurance through progressive training exercises?

The correct answer highlights the focus of strength training programs, which are specifically designed to enhance an individual's strength and endurance over time. This is achieved through progressive resistance exercises that challenge the muscles gradually, facilitating adaptations that lead to increased muscle size, strength, and stamina.

In this context, a strength training program typically includes various forms of resistance work, such as weightlifting, bodyweight exercises, or resistance bands, where the intensity and volume of the workouts can be progressively increased. This progression is crucial because it helps overcome plateaus and encourages continued improvements in physical performance.

While aerobic training primarily emphasizes cardiovascular endurance through activities like running or cycling, it does not specifically target strength improvements. Plyometric programs involve explosive movements aimed at increasing power, rather than a general enhancement of strength or endurance. Flexibility training focuses on improving the range of motion in joints and muscles, which is important for overall fitness but does not directly contribute to strength or endurance enhancements in the way a strength training program does.