Balance training device

A balance training apparatus comprising:

• a seat for a user;
• and
• a driving unit configured to drive said seat and comprising:
• a motor;
• and
• a power transmission configured to convert an output of said motor into a horse-riding motion and transfer said horse-riding motion to said seat, said horse-riding motion being a combination of a rectilinear reciprocating motion in a forward and backward direction of said seat, a first pivotal reciprocating motion about a first axis extending in a horizontal direction substantially perpendicular to said forward and backward direction, and a second pivotal reciprocating motion about a second axis extending in said forward and backward direction,
• wherein said power transmission comprises a first crank mechanism configured to provide said rectilinear reciprocating motion and said first pivotal reciprocating motion, and a second crank mechanism configured to provide said second pivotal reciprocating motion, and both of said first and second crank mechanisms are coupled to a rotating shaft of said motor.