Monitoring cortisol and thyroid hormones is crucial for two reasons; one because cortisol is involved in muscle metabolism, so its levels indicate muscle health [12,13,14]; second, thyroid hormones can influence the athlete’s health [61,62], an incorrect synthesis can cause hypo or hyperthyroidism; in both cases, these pathologies can have serious causes if not properly treated. This evidence concerns the gene TG and hyperthyroidism.