Is CLOCK useful for Sport?

The provided context does not contain specific information about the CLOCK gene in relation to sports. CLOCK is a core circadian rhythm gene, and some research suggests variants may influence sleep patterns, recovery, and athletic performance. However, the evidence is mostly mechanistic or from observational studies, not yet actionable for individual athletes. Without direct data from the given sources, the usefulness of CLOCK testing for sports remains unclear. Athletes interested in circadian optimization should focus on sleep hygiene and timing of training/nutrition rather than relying solely on genetic results. The available snippets (lifestyle checklist, product pages, other gene FAQs) do not address CLOCK. Therefore, the evidence grade is 'unclear'.