The pursuit of symmetry has long shaped discussions in sports science, particularly in sprinting, where every fraction of a second counts. Yet, the human body is inherently asymmetrical - our hearts are slightly left, most favour one hand or foot, and limb lengths or joint flexibilities are rarely identical. This begs the question: Why do we insist that symmetry is essential for peak sprint performance? Asymmetry - differences in strength, flexibility, balance, and/or mechanics between body sides - is intrinsic to human movement.1 While marked and/or persistent asymmetries can disrupt biomechanics and increase (re)injury risk, minor bilateral differences are commonplace and often functional. For example, dominant limb strength allows for efficient movement patterns, even if it creates slight imbalances.2 Perhaps the relevant question then is not whether asymmetry exists but to what extent it affects human performance. The relationship between asymmetry and sprint performance remains a subject of debate, with research often comparing kinematic and kinetic gait parameters across the left and right sides.1 While asymmetry has been a focus in recent research, significant gaps remain. Many studies have narrowly focused on the maximal speed phase,3,4 overlooking acceleration and deceleration. Additionally, research is predominantly centered on highly trained/national-level (Tier 3)5 and elite/international-level (Tiers)6 athletes, with limited data on World-class (Tier 5) sprinters.7 Sex-based differences also remain under-researched, as studies largely focus on male athletes.5,7 As our understanding of asymmetry in sprinting evolves, the conventional belief that an uneven stride slows a runner down prompts an important question: Does stride evenness truly matter for peak performance? This editorial contends that perfect symmetry is neither achievable nor necessary. Instead, the emphasis should shift towards identifying and addressing functional deficits to optimize sprinting mechanics, rather than forcing corrections that may disrupt natural biomechanics.
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