rowing machine 
noun
An exercise machine with oars and a sliding seat, for exercising the muscles used in rowing.To meet demand the centre has four treadmills, eight elliptical machines, eight stationary bikes, four rowing machines, two steppers and a range of weight machines, hand weights and stability balls....
- We've been encouraging people to try out a triathlon on a rowing machine, exercise bike and treadmill.
- Castletownshend Rowing Club have installed exercise and rowing machines in the upper floor of the Boathouse, toilets on the lower floor and are shortly to install showers.