Some of the health problems involving back pain are associated with atrophy (muscular weakness) of the back muscles, and factors such as lifestyle and work responsibilities contribute to this deficiency. Careful selection of appropriate exercises can prevent these deficits and improve the general well-being of the individual. Since the basic exercise for the back muscles is the pull-up, the constructional solution for a controlled and easily customizable pull-up training would greatly improve the functionality in case of established deficits and further improve the ability while reducing the risk of injury. Basic principles of proper exercise technique for doing pull-ups were described and an overview of active muscle groups was given. Market analysis was carried out to identify the noticed advantages and disadvantages as a basis for comparing and evaluating new solutions. A targeted user group was defined taking into account anthropometric and biomechanical criteria, requirements and limitations. The structural and functional requirements of the project are then defined, as well as the main goal, which implies the development of a safe device that will allow users to exercise the pull-up with adjustable load ranging from beginners to top athletes. Functional decomposition was then constructed and relevant patents of similar devices were examined for the purpose of generating various concepts using a morphological matrix. Generated concepts were mutually compared and evaluated to generate a final version that was ultimately developed and of which a computer model was made. The most important problem needed to be solved was the construction of a mechanism that will allow a simple change of assisted or weighted pull-ups according to user needs. This work has provided a design proposal for a device, which enables the user to easily and efficiently exercise the pull-up with an adjustable load. The targeted user group includes people of different physical characteristics, different age groups, and people with a certain degree of disability. At the end of the paper, the main function of the device is explained (pull-up exercise with adjustable load) and some side functions such as adjusting the exercise to persons with a certain degree of disability and training dips with adjustable load.