How to achieve physical fitness

Physical fitness refers to the ability of your body systems to work together efficiently to allow you to be healthy and perform activities of daily living. Physical fitness is generally achieved through proper nutrition, moderate-vigorous physical exercise and sufficient rest.

The picture above shows Anthony Joshua the Boxing champion of the heavy weight division.

Before the industrial revolution fitness was defined as the capacity to carry out the days activities without undue fatigue. However with automation and changes in lifestyles physical fitness is now considered as a measure of the body's ability to function efficiently and effectively in work and in leisure activities, to be healthy to resist hypokinetic deseases, and to meet emergency situations.

In order for physical fitness to benefit the health of an individual, an unknown response in a person called a stimulus will be triggered by the exertion. When exercise is performed with the right amount of intensity, duration and frequency, a significant amount of improvement can occur. The person may overall feel better but the physical effects on the human body takes weeks or months to notice and possibly years for full development. For training purposes exercise must provide a stress or demand on either a function or tissue. To continue improvements, this demand must eventually increase overtime. This sort of training exercise has three basic principles; Overload, specificity, and progression. These principles are related to health but also enhancement of physical working capability. 

However, Nutrition is the most important key in obtaining physical fitness because the muscles need a lot of proteins and other specific nutrients to grow bigger and stronger.