Hi Chris,
I'd try swimming as well. Great overall conditioning. You can get a board and try to flutter kick across the pool for a few laps (your legs will burn) but it will increase your endurance.
The great thing about swimming is that you can do intervals and keep it anaerobic (blast your shoulders, arms and back!) or swim slow laps for cardio and endurance.
Not sure what level of swimming you have, but if you can do the butterfly stroke it will work your entire body.
Skipping rope is also good for stamina and cardio.
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