This paper is highlighted to health consciousness of people. Fitness means being in good physical situation, being healthy, having more power and better sleep samples. A person who is fit is also capable to carry out responsibilities more easily. Fitness may help avert assured diseases such as high blood pressure, diabetes, stroke, cancer, and heart disease. You do not have to be an athlete to be fit. A brisk half-hour walk every day can help you reach a good level of fitness. Staying active and fit can also help you manage your weight and reduce the risk of obesity. Fat is a normal component of the human body that is stored in adipose tissue. Obesity can be defined as a condition of excessive fat accumulation to the extent that health and well-being are affected. Body fat can be determined in vivo in different ways, using rather accurate laboratory techniques or using simple estimation techniques that can also be applied in field conditions. Obesity results from energy imbalance: too many calories in, too few calories burned. A number of factors influence how many calories people burn each day, among them, age, body size, and genes. But the most variable factor and the most easily modified is the amount of activity people get each day. Keeping active can help people stay at a healthy weight or lose weight. It can also lower the risk of heart disease, diabetes, stroke, high blood pressure, osteoporosis, and certain cancers, as well as reduce stress and boost mood. Inactive (sedentary) lifestyles do just the opposite. This Paper defines physical activity and explains how it is measured, reviews physical activity trends, and discusses the role of physical activity in weight control.