Zbigniew Andruszkiewicz
The SkiErg is the best alternative training for rowing, with the same rhythm and engaging muscles in a very similar way. It is also an excellent supplemental exercise, strengthening core muscles and providing a cardiovascular workout at the same time. I would wholeheartedly recommend every rowing center or club to get hold of a SkiErg. Every rower, whether elite or recreational, can greatly benefit from this exercise.