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Unless it's too cold or a bad neighborhood, your best solution imho for cardio (apart from swimming) is to walk briskly (~4.0) outside for at least an hour daily.
I am finding low to moderate intensity over an hour does a lot more for me than a 30-45 minute high intensity workout ever did. Something about the adrenalin/dopamine or body machinery kicking in to overdrive after 50 minutes or so seems to be the reason.
Also I used to get a lot of knee and ankle/heel problems when running or even walking on treadmills. Since it is not a natural movement it is easy to over extend your joints. Also since you will soon be bored shitless even with tv/music, your body will find ways of cheating, thus further reducing the effectiveness and increasing the likelihood of you straining something and being out of action for a couple weeks or more.
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