A training device for a gliding sport athlete trains the athlete to have the proper knee bend for gliding sports such as ice skating, inline skating, skiing, etc. The device includes a belt and a pair of foot attachments adapted to be fastened to a front portion of the respective feet or footwear of the athlete. One end of each pair of cords is connected to the belt at a position between the front portion and a respective side portion, and another end connected to one of the foot attachments. Each of the cords has an unstretched length less than a length between the athlete's waist and feet, to apply a force to urge the athlete's knee into a bent position.