I banged up my knee in an accident and I won't be able to bicycle for a few months. I'd like to keep up my cardio and calorie burning as much as possible during my time off. What kinds of things can I do at the gym or home to try to replicate what biking gives me? I will of course need things to do that don't involve my knee too much.
I can swim, but don't have access to a pool now. I can use my knee a bit. I have even gone biking. But, even a small ride (about twenty miles) will result in knee pain and weakness for days, up to a week.