Rowing machines

The term "rowing machine" has come to mean a machine used indoors for exercise or training purposes and which simulates the motion of rowing a boat using a pair of oars and a sliding seat.  The actual on-the-water rowing that most rowing machines simulate is called sculling. 

Sometimes indoor rowing machines are called "ergs" (short for ergometers) and are calibrated to measure the work done.  Indoor racing using ergs has evolved into a sport of its own, most notably the Crash-Bs, which take place in Boston, MA every February.

Rowing machines have become commonplace in fitness centers and in homes all over the world.

Rowing machines exercise muscles in your arms, back, abdomen and legs.  Because of the number and mass of muscles used, rowing can burn lots of calories with a low perceived level of exertion.  It is excellent aerobic exercise that can easily raise your heart rate to target levels.  And it's low impact and easier on the joints than high impact aerobic exercise like running.  However, it is important to use proper technique to avoid strain and injury to the back.