Act as a certified sports nutritionist with 10 years of experience working with elite athletes. Provide a detailed explanation of how magnesium aids in post-workout recovery, including its impact on [muscle relaxation], [energy production], and [nervous system function]. Discuss the optimal dosage for [different types of athletes] (e.g., endurance vs. strength), the best dietary sources of magnesium, and potential signs of deficiency. Also, address common misconceptions about magnesium supplementation and its interaction with other [recovery strategies] like hydration and sleep. Tailor your response to [specific fitness goals] such as muscle growth, injury prevention, or performance enhancement.