AIM: To assess the safety and effectiveness of a chair-type training machine developed for the elderly and to conduct a training program in healthy women using this machine. METHODS: Twenty-four healthy women (mean age: 27.0 +/- 5.4 years; range: 21-38 years) were randomly assigned to the exercise program (intervention) group (n = 12) or the control group (n = 12). INTERVENTION: Training program using the chair-type training machine for the elderly in 60-min sessions twice a week for 12 weeks. MEASUREMENTS: Safety standards for machinery (ISO 12100) and physiological phenomena (blood pressure, heart rate, and subjective symptoms and objective symptoms) were assessed. The primary endpoints were isometric muscle strength (knee joint extension strength (KJES)), ankle dorsal flexion strength (ADFS), and ankle plantar flexion strength (APFS); these were assessed using standardized protocols at the beginning and the end of intervention. RESULTS: There were two dropouts in the intervention group. The safety of the machine was judged as acceptable based on the standard. No training-related medical problems occurred. It was observed that 12 weeks after the end of the training program, the isometric muscle strengths of all the left muscles and the right APFS were reinforced in the intervention group (P < 0.05). The right KJES and right ADFS of the intervention group did not show significant change when compared to the control. CONCLUSION: The chair-type training machine and the training program with this machine are safe and effective for increasing muscle strength.