Hydration is crucial during hot weather workouts to prevent dehydration and heat-related illnesses. When exercising in heat, the body loses fluids through sweat, which can lead to decreased performance and increased fatigue. Proper hydration helps to regulate body temperature and maintain optimal physiological function. It's important to drink water before, during, and after exercising, and consider electrolyte replenishment if engaging in prolonged or intense activity. Staying hydrated not only enhances performance but also supports recovery.