I showed this bike here 4 years ago, since then I've added folding handle bars. When I was 18 (1971) I was in top shape. I went on a lot of 20 and 30 mile rides. The day I went 50, my body started complaining, elbows, neck, ect. With this bike, I switch from front to back quite often, and I don't get stiff, plus, I'm using different muscles or just using them differently, and switching seats feels like switching from tired muscles to fresh ones. The bike is heavier and less efficient than my Cannondale, but anything over 20 miles, I'm taking the 2 seater.
http://www.roadrecumbent.com/