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Another vote for cycling. Or indoor spinning classes if you need the motivation to get you working hard on the bike.
Personally get bored stiff on the rowers so don't use them although the top guys do. Concept 2 have also produced a book with specific rowing exercises/programmes for laser sailing. They were giving them away at the RYA Dinghy show this year so may well give you one if you contact them to ask.
Is this the guide you mean ? http://concept2.co.uk/training/sailing
(or the one you get from the "Download" button on that page)
Ian