Best Exercises to Burn Cal w/Leg Injury

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At about 3 miles into a long run, I sprained my ankle flexor muscle and can't exercise it for over a week. I'm interested in knowing what others do when injured to make up the daily calorie burn loss from not being able to use your legs to exercise?

I've been using upperbody cardio krank equipment but am interested in any other ideas from the collective wisdom of MFP folk?

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