Sorry to hear about your foot. What type of things to you have access to? You can definately set up an upper body/abdominal circuit and run through it w/ minimal rest between exercises to get your heart rate up ( 30second intervals with 30 seconds rest). For example, a push followed by a pull then some abs and keep going in this fashion. I know some gyms also have upper body cardio equipement, for example the Cybex UBE. This is not the most exciting piece of equipement, but it will give you a decent CV workout. Good luck.
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