When is Sportgene Test actually useful?

A sport gene test can be useful in very limited scenarios, such as understanding why certain training types work better for you (e.g., ACTN3 for sprint vs. endurance). However, the evidence is weak: most gene variants have small effect sizes and are not predictive of actual training outcomes. The test does not replace performance diagnostics or medical advice. For recreational athletes, the benefit is usually low; for competitive athletes, it may serve as an additional puzzle piece but not as a basis for training decisions. Be cautious of exaggerated marketing claims. Overall evidence level: marketing/unclear.