How can I still exercise with a fractured foot?

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On the last day of April, I fractured a bone in my foot. The doctor at the hospital said that I should elevate and ice it at least 3 times a day and prescribed me with painkillers. Lately, it hasn't been bothering me too bad but I'd still like to take it easy so it heals properly.
Any ideas on exercises I can do without straining my foot?