Sedentary lifestyles are caused by insufficient physical activity and exercise and can lead to weight gain, obesity, heart disease, diabetes, and a weakened immune system. Many jobs require sitting for long periods which promotes a sedentary lifestyle, and some people lack time to exercise or eat healthy after work. However, individuals can choose more active jobs or make time for physical activity and nutrition. The document provides ideas for exercise like taking the stairs, walking, running, lifting weights, dancing, and playing sports. It also lists sources used.