The brochure “You’re Active in the Heat. You’re at Risk!” provides critical guidance for people who engage in physical activity during periods of extreme heat. It emphasizes that exertion in hot conditions increases the risk of heat-related illnesses, especially for those with underlying health issues or taking certain medications. The content explains how the body regulates temperature and why heat combined with exercise can overwhelm these systems. Key recommendations include hydrating before, during, and after activity; wearing lightweight, breathable clothing; planning exercise during cooler hours; and taking frequent breaks in shaded or air-conditioned spaces. It encourages gradual acclimatization to heat and urges individuals to recognize early warning signs of heat exhaustion, such as dizziness, nausea, and rapid heartbeat. In the event of severe symptoms like confusion or fainting, immediate cooling and emergency assistance are advised. This guide supports safer physical activity practices and promotes heat resilience as temperatures rise seasonally and with climate change.