We love carbon-free travel and human-powered transport. There are few forms of exercise that are more efficient and work more muscles than cross-country skiing. Designers I.Kiryakov, S.Ballmeier, K.Eichelberg & M.Dressler appear to have mounted a nordic-trak exercise machine onto a racing canoe hull to create an 8 metre (26') craft that can go 6.5 knots. The cross-country action is converted to forward motion by a rear flipper. The rear is low and flat as a swim platform, the front thin and long for sunbathing. Of course one of the best summer exercises is rowing and a good sculler can go at 9 knots with a lot less technology, but hey, scullers can't see where they are going. ::tu-fin via ::yanko
Update: article in Speigel online. It appears that this design was part of a student competition.