I hate all forms of cardio and it is a constant struggle for me to do it. The best cardio (for me anyway) has been sparring (either with an opponent or just beating the shit out of a heavy bag
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), rugby, and rowing machines....but needless to say, you need some form of conditioning to do those for any extended period of time hahaha. Fucking vicious cycle if you ask me, I have to do cardio in order to do my cardio (if that makes sense haha)
I used to bike quite a bit but I find it fatigues my legs if I want to get any cardio out of it, then it affects my squatting if my legs really get hit hard. I usually 'stick' to cardio that is minimal in muscular effort (elliptical, rowing machine, boxing etc.)