Health related fitness is to health as skill-related fitness is to skill.
Both refer to types of fitness related components and they determine how well able a person is in performing tasks that require effort. Health-related fitness components aims to evaluate how able is person's body to perform certain activities. This includes tests for CV endurance, muscular strength, muscular endurance, flexibility, and body composition. While skill-related fitness aims to gauge a person's specific skill in specific sports-related activities. This includes tests for agility, balance, coordination, speed, and reaction time.
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Being sedentary means you don't move around (stay in one place).
People who are sedentary could play video games at their computer all of the time, which means they stay up late.
Staying up late leads to sleep deprivation.
Thus, video gamers could have sleep deprivation.