His attitude is actually quite different in person.
Anyway, jogging/running is obviously out for RBNT if he has knee issues.
I can't understand his knee issue, there's an interesting thread about wrecked knee's and squat's here http://ausbb.com/injuries-rehab/13196-who-has-long-term-experience-wrecked-knees-squats.html
If you don't know how to squat properly though it might not work
Cycling can do knee damage too, just less than jogging
If you really want to do cycling, HIIT does work best, so high intensity interval training is the most effective form of cardio.
Although I'd still recommend tabata thrusters, depending on your knee issue you may be able to squat down with 8kg weights (or maybe not).
NissanSiliva had a thread about this a while ago, but the forum has gone downhill, all the serious posters are on ausbb.com