What is TRUE about fast glycolytic (FG) fibers?

Fast glycolytic (FG) fibers are primarily designed for short bursts of high-intensity activity, making them crucial for exercises that require speed and power, such as sprinting or lifting heavy weights. These fibers generate energy through anaerobic glycolysis, allowing for rapid ATP production but at the cost of endurance. Unlike oxidative fibers, which utilize oxygen for energy, FG fibers have a lower capacity for endurance due to a reduced number of mitochondria and myoglobin. Their structure and metabolic pathways are specifically tailored for quick, explosive movements, which is why they excel in activities that demand strength and speed rather than prolonged activity. This characteristic makes FG fibers distinct among muscle fiber types.