Chronic illnesses can significantly impact physical activity levels by limiting mobility and causing fatigue, pain, or discomfort. Conditions such as arthritis, diabetes, or cardiovascular disease may discourage individuals from engaging in exercise due to fear of exacerbating symptoms. Furthermore, some chronic illnesses affect energy levels, making exercise feel overwhelming. It's essential for individuals with chronic conditions to consult healthcare providers for safe exercise options tailored to their specific needs, allowing for gradual integration of physical activity into their lives.