1) Indirect cardiac adaptations such as short-term increases in cardiac output and longer-term increases in capillary density of type I fibers (6). Collectively, these adaptations may promote blood flow to soft tissues and, in turn, nutrient delivery (7) and clearance of metabolic wastes (8). Obviously, the ability to generate and maintain body heat as a result of greater capillary density can also prove highly beneficial for strength and power athletes as well.
2) Reduced delayed onset muscle soreness (DOMS) (8), possibly related in part to the aforementioned improvements in nutrient delivery and clearance of metabolic wastes.
Ever wonder why baseball pitchers often go for long, slow jogs on the day or two after they throw? Strength and power work does little to improve circulation, so this work is welcomed relief from rigorous 120-pitch outings (or punching clubhouse walls, if your name is Kevin Brown).
3) An opportunity to practice crucial movement patterns when the exercise chosen in competition-specific (e.g. light squats, benches or deadlifts for a powerlifter).
4) Enhancement of psychological well-being (9).
5) Improved insulin sensitivity (10), allowing for more efficient utilization of dietary carbohydrates in restoring glycogen and stimulation of protein synthesis.
6) General physical preparedness (GPP), defined by Verkhoshansky as "conditioning exercises designed to enhance an athlete's general, non-specific work capacity" (10). As an athlete's work capacity increases, so too does his ability to adapt to increases in imposed volume demands.