Fitness is an ongoing activity that promotes optimal health for the individual. Fitness can be defined as an association between the physiological processes and the psychological or social attitudes that support health. Fitness is the state of complete well being and, more importantly, the capacity to do different parts of daily tasks, jobs and sports well. Fitness is normally achieved through proper nutrition, regular physical activity, and adequate rest. Health professionals consider a healthy lifestyle to be one that involves physical education, healthy practices, and an attitude of care and concern for the entire person.

Fitness involves the evaluation of the structure and function of all the components of the human body and the regulation of these components during physical activity. Fitness helps to improve the body’s resistance to injury and illness. It also helps to enhance the functioning of the immune system and improves the functioning of the cardiovascular system. The objective of fitness programs is to promote healthy changes in the structure and function of the human body through regular and prolonged exercise.

The primary component of physical fitness involves the evaluation of muscular structure and function. The major factors that affect the muscular structure and function are: muscle power, muscle length and hypertrophy, and flexibility. Muscular endurance is influenced by the force with which the muscle contracts, while muscle strength depends largely on the force with which the muscle relaxes. Both of these muscular structures and functions can be improved through proper training and progressive levels of resistance. While improving muscular strength, the resistance should be progressive, which means that it should increase gradually rather than suddenly.

There are many factors that affect fitness levels, but the three most important factors are the intensity of an exercise, frequency of exercise, and persistence. High levels of physical fitness require a lot of exercise and a large amount of time invested in it. Frequent exercise enables the individual to build his muscle strength, while persistent exercise keeps the individual physically fit. Physical fitness means maintaining a regular level of activity for at least three hours daily.

The best way to improve muscular endurance and muscular strength is to perform the same exercise consistently and regularly. It is recommended to change the exercise routine every two weeks. A decrease in fitness level results from a decrease in the frequency and intensity of exercises. It also results from a decrease in the quality of the workout.

Proper nutrition is an important factor that affects overall physical fitness. An individual who consumes a balanced diet, with adequate amounts of water and carbohydrates is more likely to remain fit and active. Consuming small amounts of protein and fats is also important, since they help the body to recover after each workout session. The best diet for fitness includes a combination of fruits, vegetables, whole grains, and lean meats. Whole grains, fruits, and protein sources such as nuts, eggs, and fish have been found to improve immune function and are therefore highly recommended for fitness.