What happens to muscle fibers during resistance training?

During resistance training, muscle fibers undergo a process of microscopic damage, which is a natural response to the stress placed on them. This creates a stimulus for the body to repair and strengthen those muscle fibers. The repair process involves the synthesis of new proteins, which leads to an increase in the size and strength of the muscle fibers, a phenomenon known as hypertrophy.

As the muscle fibers adapt to the resistance training, they not only grow larger but also become more capable of handling increased loads in the future. This adaptive response is crucial for enhancing overall physical performance, which includes improvements in strength and muscular endurance over time. Hence, the correct answer reflects the fundamental principle of muscle adaptation during resistance training, highlighting the role of repair and growth in muscle development.