Sports scientists have long investigated the

Position 1: Nevertheless, targeted training programmes can partially modify fibre characteristics, offering athletes some capacity to optimise their physiological profile.

Position 2: Skeletal muscle contains two primary fibre types: slow-twitch fibres, which are resistant to fatigue, and fast-twitch fibres, which generate rapid, powerful contractions.

Position 3: Recent genetic research suggests that fibre-type distribution is largely inherited, placing inherent limits on an individual's trainability in certain disciplines.

Position 4: Sports scientists have long investigated the relationship between muscle fibre composition and athletic performance.

Position 5: Elite endurance athletes such as marathon runners typically possess a higher proportion of slow-twitch fibres, whereas sprinters tend to have more fast-twitch fibres.