Hill's Recruitment

Hill's Recruitment theory explains how the human body recruits muscle fibers during physical activity. When a movement begins, the brain first activates the smaller, slow-twitch fibers for endurance and efficiency. As more strength is needed, it progressively recruits larger, fast-twitch fibers responsible for power and speed. This ordered process ensures energy is used efficiently and that additional fibers are brought in only when necessary. The theory helps guide training strategies by emphasizing gradual increases in intensity to stimulate different muscle fiber types effectively, ultimately improving strength and performance.