There could be several possible explanations for why some sprinters weigh almost the same as their competitors but are still faster. Here are some:


Muscle mass: Sprinting is a power-based activity that relies heavily on explosive strength, which is typically associated with larger, more powerful muscles. It's possible that some sprinters who weigh the same as their competitors have a higher percentage of muscle mass, particularly in the lower body, which can give them a performance advantage.


Body composition: Body composition refers to the ratio of fat mass to lean body mass in the body. Sprinters with lower levels of body fat and a higher proportion of lean muscle mass may be able to generate more power and accelerate more quickly than their competitors.


Technique: Sprinting is a highly technical activity that requires proper form and technique to maximize performance. Some sprinters may have better biomechanics or more efficient running mechanics, allowing them to move more quickly and efficiently than their competitors.


Mental preparation: Sprinting is a mentally demanding activity that requires focus, concentration, and a high level of mental preparation. Some sprinters may have better mental preparation or more effective mental strategies that allow them to perform better under pressure.