Resistance training equipment, such as cable machines, typically employs a system of adding resistance in specific, measurable steps. These standardized additions of weight, often utilizing plates or other mechanisms, allow users to progressively overload their muscles. For instance, a machine might allow adjustments in units of 2.5 pounds or 1 kilogram.
Gradual increases in resistance are fundamental to strength and muscle growth. This progressive overload principle encourages the body to adapt and become stronger over time. The ability to fine-tune resistance is particularly valuable for accommodating various fitness levels, from beginners to advanced athletes, and for facilitating recovery from injuries. Historically, weight training relied on fixed barbells and dumbbells, offering limited options for incremental adjustments. The introduction of plate-loaded and selectorized machines allowed for more precise and controlled progression, opening new possibilities for exercise programming.