What to watch with Fitness Vitality DNA and Sport?

The MyBody-X Fitness Vitality DNA test and similar sport nutrigenetic tests are based on real gene–diet interactions, but effect sizes are small and evidence is mostly observational. They cannot reliably predict whether you are better suited for endurance or sprinting, nor can they prescribe a personalized VO₂max training plan. Use them as curiosity tools, not as training prescriptions. Be aware of overblown marketing: single SNPs like ACTN3 or PPARGC1A have weak predictive power. For children (e.g., soccer), there is no evidence that microbiome tests improve recovery. Instead, focus on balanced nutrition, sleep, and well-structured training. The test may provide motivation but should not replace professional sports medicine advice.