"Rowing motion" refers to the movement made when rowing, which consists of pulling the oars through the water by using your arms, back, and legs in a coordinated manner. Full definition
This is far more effective than using fat grips because it will force you to perform rowing motions optimally by eliminating excessive momentum and range of motion, while overstretching will cause the weight to slip out of your fingers. (fitnessandpower.com)
As you sing «Row, Row, Row Your Boat,» pull each of their arms in a gentle rowing motion before lowering them slowly back down onto the pillow as you sing the «Merrily merrily merrily» part. (bounty.com)
The resistance on this one is hydraulic rather than water so it is not quite as realistic as some of the others, but the actual rowing motion is much more realistic than some of the more expensive machines. (healthcare-online.org)