Final answer:
To be at an elite level, a football lineman must possess more fast twitch muscle fibers, specifically fast glycolytic (FG) fibers. These fibers are responsible for producing rapid, forceful contractions.
Step-by-step explanation:
To be at an elite level, a football lineman must possess more of fast twitch muscle fibers. Fast twitch muscle fibers, specifically fast glycolytic (FG) fibers, have fast contractions and primarily use anaerobic glycolysis to produce ATP.
These fibers are responsible for producing rapid, forceful contractions that are needed for quick and powerful movements on the football field. However, it's important to note that most muscles in a human body contain all three types of muscle fibers, but in varying proportions.