Exercises for person with injured foot

[Guest guest]

Hi everyone:

I haven't posted in a while but I have come across a dilemma. I used

to be an avid exerciser using DVDs and videos. A month ago I fell

from an 8 foot ladder and broke my heel. I can't walk for a good

while. I was wondering if anyone can suggest some exercises that I

can do to keep in shape? I know I can do upper body and abs. I am

just trying to figure out how to get some cardio in without being able

to walk or bear weight on my foot. Any suggestions?

Thanks!