are there any stairs? you can walk/run the stairs going up and down if that does not hurt your knee. There are also knee protection things you can wear when you do your cardio. I have seen plenty of people including basketball, soccer, softball, etc. players wear them for knee stability when doing an activity.
you can also do cardio kickboxing (making up your own moves mixed with self defense, karate, boxing, etc). All you need is your arms and legs (nothing else).
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