In reply to The Green Giant:
> Is shaving a minute and 20 seconds off a 2000m time really a viable goal?
> In the rowing world is rowing a concept 2 to rowing on water as top roping is to leading?
> Luckily where I live at the moment has a rowing club pretty much opposite, hopefully they can speak better English than I can German.
Most of the world record holders on the ergs are national team athletes who also have world titles and Olympic medals on the water, and train full time. For a guy your size, training with a good club, getting under 6 minutes is achievable within a couple of years.
Yes, the ergs are primarily a training tool for rowers - it allows one to work on certain aspects of the stroke (efficient drive, rhythm, muscle memory) and improve as an athlete (cardiovascular and muscular training) without having to worry about the additional complications of doing it all in a difficult to balance racing shell on the water.