Training device and utilizing method thereof

A training device, comprising:

• a main assembly, comprising:
• a housing;
• an engaging component, comprising a pin disposed on the housing;
• and
• a driving component, disposed in the housing;
• and
• a first attachment assembly, comprising:
• a first rod, one end of the first rod being connected to the driving component, wherein the driving component drives the first rod to rotate;
• and
• a first attachment component, disposed on the first rod, comprising:
• a first fixing unit, comprising a releasable fastening structure configured to dispose the first attachment component on the first rod;
• and
• a second fixing unit, configured to attach to a user,
• a second attachment assembly, comprising:
• a second rod;
• and
• a second attachment component, disposed on the second rod, and configured to attach to an external device;
• and
• a movable component, comprising:
• a first rotating unit, rotating about a first rotating axis, and comprising a slot for receiving the pin of the engaging component;
• a second rotating unit, connected to the first rotating unit and rotating about a second rotating axis, wherein the first rotating axis is different from the second rotating axis;
• and
• a ring structure, having an adjustable level of tightness, connected to the second rotating unit and encircling the second rod,
• wherein the slot is defined by a groove formed by joining two clamping pieces of the first rotating unit, and the movable component is rotatable about an axis of the second rod through the ring structure,
• wherein the driving component comprises:
• a driver, configured to detect an external force applied by the user through the first rod, and provide an auxiliary force for driving the first rod;
• and
• a controller, configured to control at least one of a strength, a time period and an operating range of the auxiliary force provided by the driver according to the external force,
• wherein the auxiliary force is an assisting force in the same direction as the external force or a resistive force in an opposite direction to the external force.