By performing resistance exercise, you add myofilaments. You do not add muscle fibers.

This statement emphasizes an important aspect of muscle physiology. During resistance exercise, the body undergoes a process known as hypertrophy, which involves the enlargement of existing muscle fibers rather than the creation of new ones. Myofilaments, which include actin and myosin, are the contractile proteins found within muscle fibers.

As resistance training occurs, these myofilaments increase in number and density, allowing muscle fibers to generate more force. This leads to an increase in muscle size and strength over time. It’s crucial to understand that muscle fibers already present in the body do not multiply significantly; instead, they grow larger due to the synthesis of more myofilaments and other structural proteins.

This process is beneficial for athletes, fitness enthusiasts, and anyone looking to improve their physical performance or maintain muscle mass as they age. Resistance training can also enhance metabolic health and support overall physical functionality. It’s important for individuals to pair such exercise with proper nutrition, including adequate protein intake, to support muscle recovery and growth.