Last spring I went to a double dutch class, and here is what happened: I loved it so much that I joined the instructor Andrea's team, On The Double (Dutch)! We will be doing public performances beginning in Spring 2009.
The Seattle adult women double dutch class I attended was recently featured on Kiro TV news. You can get information about double dutch classes for children or adults at NW Double Dutch. If you are worried about bad knees or stiff bones, I would like to mention that the floor at Community Fitness (the location of the adult women class and some of the kid classes) is a cork floor which is easier on the bod than the pavement you used to jump rope on at recess as a kid. Also, double dutch is not as difficult as you think it is, and Andrea can usually get everyone doing at least one trick in the ropes by the end of the first class. Andrea is heading down to Mexico to teach double dutch for a couple of months so classes will start up again in Seattle in February.