A training device includes a motor including a sensor member connected therewith which is electrically connected to a vibration control unit which controls the motor via commands from a user. A torque output unit is connected with an output shaft of the motor and transfers a resistant force to users and to transfers the force from the user to the motor. The torque output unit includes a speed reduction unit and a tension unit so as to transfer proper force between the motor and the users. The vibration control unit sensing status of the motor according to input commands so as to control the motor simultaneously to generate vibration and resistant force on user's muscles by rotating to-and-fro repetitively.