High-intensity training (HIT) stimulates significant muscle growth by promoting greater recruitment of fast-twitch muscle fibers, which are crucial for strength and hypertrophy. This type of training induces high levels of muscle stress, leading to greater muscle damage and subsequent repair processes that contribute to muscle development. Additionally, HIT can enhance the production of anabolic hormones, such as testosterone and growth hormone, further facilitating muscle growth. Combined with adequate nutrition, high-intensity workouts can lead to substantial improvements in both muscle size and overall fitness levels.