There are two types of rowing machines. A hydraulic machine uses a piston to provide the resistance. With a cable-driven machine, your pull spins a flywheel which produces a smooth action similar to rowing on water.
The smoothness of the flywheel creates little strain on the back. If handles are not adjusted properly for height differences, hydraulic rowers can create back strain.
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Rowing machines provide a whole-body aerobic workout: arms, shoulders, back, abdomen, legs, heart and lungs. It also builds muscle strength and endurance in addition to the aerobic benefits. It improves your whole cardiovascular system with a low impact workout. Other benefits include improved flexibility and muscle strengthening in the arms, abdomen, and back.