The apparatus includes a watertight elongate housing extending along a longitudinal axis and defining an inner chamber, a track disposed around the housing on its longitudinal axis and enabling the apparatus to move when the track is rotatably driven around the housing, a handlebar connected to the housing and extending rearward, and a track-driving motor. The motor is located within the inner chamber of the housing and includes an output shaft mechanically connected to the track. The apparatus can also include a ventilation circuit for ventilating the inner chamber of the housing and a generator for producing electricity.