Final answer:
The main advantage of speed loading is to enhance strength and power, targeting the muscle's ability to quickly contract and generate force, mainly impacting fast-twitch muscle fibers. Hence, option c is correct.
Step-by-step explanation:
The principal benefit of speed loading is to increase strength and power. Speed loading refers to a type of training that improves the ability of muscles to contract quickly and generate force.
In the context of exercise physiology, anaerobic exercises like speed loading or resistance training are effective methods for increasing muscle strength and power, particularly in fast-twitch muscle fibers. These exercises contribute to the development of connective tissue and make tendons stronger, which is crucial as muscles generate more forceful contractions.
In contrast, aerobic exercises boost muscular endurance and cardiovascular health, while endurance training typically increases the capacity for aerobic activity without significantly impacting muscle strength and size like resistance training does.