Task: Completing Chapter 1 1.1 Introduction Health is a physical, mental and social well-being state in its entirety. A people need a healthy diet and must exercise regularly for a healthy life cycle. People also have to live in a nice shelter, sleep well and have good hygiene habits. When one or more organs or systems of the body are adversely affected as they are interrupted in their normal functioning, that means their body are not healthy and have a disease. Disease means the body feel unwell or body dysfunction. That is why people need to be aware with their health. The most important thing is to check on body heart rate. Heart rate device is really popular nowadays. People often use it during working, resting and also exercising. Even though most country has people with health problem, not forget there are also people that really care about their health by keep themselves fit most of the time. However, mos...