Yes! The mother of indoor rowing competitions is the CRASH-B Sprints, held annually in Boston. The Charles River All-Star Has-Beens started when the U.S. boycotted the Olympics in 1980 — during the same era that Concept 2 launched their Model A; necessity met opportunity. CRASH-B is still held with aplomb and doesn’t require any special qualification of its applicants.
From a fitness perspective, the WaterRower Natural works 84 percent of your muscle mass, helping tone and strengthen your muscles while burning far more calories than most other aerobic machines. The exercise is also low impact, as it removes all the body weight from the ankles, knees, and hips, but still moves the limbs and joints through a full range of motion--from completely extended to completely contracted.