What is an element of exercise technique that can be varied or manipulated to achieve a certain goal and address a specific need?

One key element of exercise technique that can be varied to achieve specific goals is the intensity level, which refers to the amount of weight lifted or the difficulty of the exercise. Adjusting intensity can help target different muscle fibers and energy systems; for example, higher intensity with heavier weights promotes strength and muscle hypertrophy, while lower intensity with higher repetitions enhances muscular endurance. Additionally, manipulating rest periods between sets can further tailor the workout to specific needs, such as increasing cardiovascular endurance or maximizing strength gains.