The trend of development and expansion of healthcare and fitness franchises in the world is becoming a global phenomenon, having in mind the advantages that franchising as a business concept provides in relation to starting your own business. Healthcare and fitness clubs are increasingly deciding to enter the foreign market by using franchising as an internationalization strategy with the aim of minimizing costs and business risks. Most of the healthcare and fitness franchise companies come from the USA, but there is also a noticeable trend in the development of healthcare and fitness franchises on a global level. The paper analyzes healthcare and fitness franchise companies that are ranked on the list of top 500 franchises for 2020 according to magazine Entrepreneur. The aim of the paper is to determine the impact of internal factors, the size and the age of the franchise company, on the implementation of franchising as a strategy of internationalization for franchisors in healthcare and fitness industry.