Do you live in a place with no wind, making the sail-bike simply impractical? Don't worry, there's a boat-bike with your name on it. It's the RowBike!!
As you might have thunk, the RowBike is a combination of a bicycle and rowing machine designed to get more muscles involved in your daily workout. You still work your legs because you slide back and forth on the frame, but you also get your abs, biceps, delts, pecs and other upper body muscles in on the action. According to the company, that equates to fifty percent more calories getting flamed off than the average exercise bike. They also claim that due to the gliding motion, the Rowbike is less impactful on your joints, providing a more natural workout.
Gotta be honest: I'm not really a fan of gimmicky bicycles, and this one is definitely not an exception. The bicycle's been around for a long time and it's done pretty well for itself. And have you ever seen a professional--or even an amateur--cyclist? They're in pretty good shape and they don't have to endure rowing their bicycls in public.
If you want a rowing machine, you get a rowing machine. If you want a bike, you get a bike. That's my take, anyway.
If you disagree, you'll find several models of the Rowbike starting around $1,350 for the men's and $1,188 for the ladies' (again, just buy a bike, it'll save you some dough). The bike comes with a 60-day, money-back guarantee (minus shipping/handling), so if Rowbiking ain't your thang, you can spend that money somewhere else (like on a real bike). The Rowbike is also available on Amazon here.