my personal philosophy on conditioning for combat sports is to make the running or whatever your doing specific to what your going to be doing. if your going to be fighting 3, 3 minute rounds for example run 3 800 meter runs with one one minute rests. do weight lifting circuits, or pad work that simulates rounds. I also think distance running and spirts are very benificial. distance running helps your ability to train longer and really helps when your digging deep for energy at the end of rounds. sprints helps speed and expolsiveness as well as condidtioning in an intense fight. there are tons of running programs you can do. I think a mix of distance, sport specific, and sprinting will give you the overall best results. i really think crosstraining works well. remember conditioning is a process and does not happen over night, make a plan, set goals, and progressions, and stick to it.