Act as a certified nutritionist with expertise in sports science and energy metabolism. Explain the critical role of phosphorus in energy production, focusing on ATP synthesis and its relevance to physical performance. Discuss how [DIETARY SOURCES] like [FOOD ITEMS] can optimize phosphorus levels for [ACTIVITY TYPE] athletes, such as runners or weightlifters. Highlight potential deficiencies and their impact on energy levels, muscle recovery, and overall fitness. Provide actionable tips for maintaining adequate phosphorus intake through [MEAL PLANS] or [SUPPLEMENT OPTIONS], tailored to the needs of active individuals.