The mass and strength of skeletal muscles decrease with increasing age, especially those of the knee extensor muscles. For elderly people, the decrease in force-generation capability of the knee extensor muscles reduces their ability to perform activities of daily life. Hence, the maintenance and/or improvement of knee extensor muscle strength is very important for elderly individuals. Home-based squat training without any special equipment or venue is considered to be useful for preventing age-related decreases in strength of the knee extensor muscles. The current study was designed to develop an administration system for elderly people to routinely perform body mass-based squat training at home. The characteristics of the new system are the use of onomatopoeia to allow participants to self-check their movements during squat training, and the provision of feedback functions for maintaining motivation towards the training. We performed an experiment to test the validity of our vision using a pilot version of the administration system. However, clear effectiveness of our proposed system was not proven. In this experiment, we used onomatopoeia for only one position, despite the fact that onomatopoeia are useful for evaluating and focusing upon differences in movements involving multiple joints. Hence, it is reasonable to assume that the full benefit of onomatopoeia was not realized with the current experimental design. Judging from the current results, our plan related to this system requires further refinements.