Why does skeletal muscle size increase?

Skeletal muscle size increases primarily due to a process called hypertrophy, which occurs when muscle fibers undergo stress from resistance training or Weightlifting. This stress leads to microscopic damage in the muscle fibers, prompting the body to repair and adapt by increasing the size and strength of the fibers. Additionally, hormonal responses, such as the release of testosterone and growth hormone, play a crucial role in promoting muscle growth. Proper nutrition, particularly protein intake, also supports this process by providing the necessary building blocks for muscle repair and growth.