The main aim of this thesis is to compare the recommendations on the kind and amount of exercise required for maintenance and improvement of one's physical health and quality of living as well as the improvement of one’s anthropological state. Recommendations available on internet portals will be compared to recommendations based on professional and scientific literature to gain insight into the validity, accuracy and reliability of information available on the internet. The credibility and applicability of that information in real life will be verified on the example of high intensity exercise as a basis of all currently popular modern fitness program, known as CrossFit, Insanity and Boot camp as well as certain medium intensity exercises such as workout in water, that are also publicly promoted as useful for one’s health. The validity of such programs for maintaining one’s health and quality of life as well as other objectives, such as reducing excess body fat or increasing muscle mass, will be investigated by taking into account recommendations of legitimate scientists and scientific institutions and comparing them to recommendations that we encounter on internet portals. Recommendation, advices and methods of achieving desired results accessible on the internet can be harmful for individuals who have never engaged in any physical exercise or live an extremely sedentary life, especially in regards to high intensity exercise performed independently at home without professional supervision. All forms of physical exercise, high intensity as well as medium intensity, should be conducted in appropriate conditions and under professional supervision in order to improve the likelihood of meeting one’s need for mobility and self-actualization as well as reducing the risk of potential injury and giving up on exercise altogether.