I suggest investigating interval training, which would be your option 2. Fighting requires high intensity and may not actually last that long; a low intensity jog will not put your body under the same strain.

It's also not necessary for the distances for your low and high intensity training to match.

I suggest investigating interval training, which would be your option 2. Fighting requires high intensity and may not actually last that long; a low intensity jog will not put your body under the same strain. Vox has a recent update to an article explaining some of the science relating to particular workout routines and VO2 max measurements.

It's also not necessary for the distances for your low and high intensity training to match.