There is a program on American Public Broadcasting that you can probably find in Canada or on the web called, Sit and Be Fit.
And any exercise I can think of can be regressed to a seated position. Use a little imagination. I teach CEC courses and include the concept of using Smart Steps to bringing fresh ideas to your classes. They are:
Use your imagination.
Experimenting with possible combinations before you introduce them to a class.
Decide which movements do and do not work for your purposes.
Think through how you would teach the movement combination.
Work on cues for the movement combination.
Then try them in an appropriate class setting.
You can check out my website at www.hawaiifitnessacademy.com .