Abstract: The novel paddling adapter attachment apparatus for rowing machines is designed to be replaceably attached to a rowing machine in order to transform the rowing machine into a canoe paddling training device. The apparatus comprises a seating assembly that contains an adjustable seat and footrest that are mounted on a monorail unit. A separate paddling simulator unit contains sets of guide rollers for the unit's guide chain and the paddle rope attachment. A plurality of guide roller set are housed in a rear mast housing and also in the front mast housing. A travel pulley is used to attach the paddle rope attachment to the unit drive chain. The paddling adapter attachment apparatus is designed to be temporally attached easily and quickly and can be removed as easily and quickly from the rowing unit and allows the user to simulate the single blade, seated position canoeing stroke.