 Sedentary lifestyle. A secondary lifestyle is a type of lifestyle with little or no physical activity. A person living a secondary lifestyle is often sitting or lying down while engaged in an activity like reading, socializing, watching television, playing video games, or using a mobile phone flash computer for much of the day. A secondary lifestyle can potentially contribute to ill health and many preventable causes of death. Screen time is a modern term for the amount of time a person spends looking at a screen such as a television, computer monitor, or mobile device. Excessive screen time is linked to negative health consequences.