In order to maintain a proper functionality of a human locomotory system, improve health and decrease the chances of an injury, it is important for people to exercise. There is an abundance of gym equipment and machines that allow a wide array of possible workout regimes. In the process of designing a large number of these fitness machines, often times the recreational exercisers and beginners are neglected. They are the population to which the assistance while exercising is the most important, since they have to learn complex body movements that include a large number of muscle groups. This work aims to offer a new design solution of a device that provides controlled therapeutic and sports synergistic exercising. One of the available fitness machines (Smith machine) partially meets said requirements, so that machine was the starting point for new design solutions. A new design solution of the machine that ensures users perform biomechanically correct movements with a high level of safety is given. Besides that, a large number of possible exercises to be performed with this machine alongside machine's flexibility further increase the market value. The main safety part of the system consists of cables, springs and braking elements which, in interaction with the user, stop the weights at the specific location of the machine, thus allowing a quick stoppage of an exercise. The weights assembly is designed so that it can precisely follow the movements of the user, assisting the user and ensuring no unwanted movements due to lack of attention or inexperience can be performed. Therefore, this machine has the potential to completely replace similiar fitness machines because it contains a large number of their features with significant improvements. Accordingly, main advantages in comparison to existing fitness machines are: biomechanically correct movement pattern, easily activated high level safety system, diversity and flexibility of usage. Since the new and improved design solution represents a new principle for this kind of fitness equipment, before the commercialization of this solution, critical parts should be tested and subsequent alterations and part dimensioning should be done.