For most people I'd agree that the jog is less tiring, but I think the specificity of fitness is sometimes underestimated.
Example:
Person (A) trains only for a three * five minute round fight. He never works out beyond five minutes at a time, and never exclusively focuses on aerobic work.
Person (B) trains only for the jog. He never does any high intensity work whatsoever, only six mile runs.
There's no doubt in my mind that in a medium intensity fight vs medium intensity jog, (A) finds the fight easier and (B) the jog.
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