In the above picture you can only see the rhythms and the scale degrees of the melodies for both hands and pedal.
Play 3 rounds for time of:
2 repetitions in C major
2 repetitions in G major
2 repetitions in F major
Here is a PDF file for printing.
When you are done practicing, post your time to comments.
By the way, in 2014 we celebrate 400th anniversary of this important North German composer (predecessor of Buxtehude in Marienkirche in Lubeck), so I hope you will play some of this fascinating pieces this year.