This is the conceptual BWM (Bike Washing Machine) designed by students at Dalian Nationalities University in China. It washes clothes while you get your cardio. Obviously, it will never make it past the conceptual stage because even Lance Armstrong isn't into exercising his clothes clean.
"When you ride this bike, the pedaling motion causes the drum of the washing machine to rotate," the students wrote on design site Tuvie. "At the same time, superfluous electricity is generated, which can be used to power the display screen or stored for future use."
Alternatively, stir your clothes in a barrel with a stick. That's exercise too. Then when they're clean I hang them up on the line and beat them with another stick to dry them. I live an old fashioned life. I make my own butter too. "Out of cow's milk?" You make butter out of cow's milk? "How have you been doing it?" Oh boy. I've gotta stop Peter before he gets to the farmer's market!
Keep going for two more completely unnecessary images.