Act as a sports physiologist with 10+ years of experience researching environmental effects on human performance. Analyze how [temperature range, e.g., 10°C to 35°C] impacts [specific athletic activity, e.g., marathon running] in terms of [key metrics like heart rate, endurance, or recovery time]. Provide evidence-based recommendations for athletes training in [hot/cold/moderate] climates, including hydration strategies, acclimatization periods, and performance thresholds. Use case studies or peer-reviewed research to support your conclusions.