Conner, like I said, I've done both and sometimes ran from practice to go do muay thai or karate at night. I can tell you when I was in football shape, the other stuff came easy. I mean, I even did Judo and sure it it was tiring practicing all the break falls, but doing up-downs in full pads during 100 degree weather had it beat. And I understand the whole speed-power you're throwing out, but you can gain a lot of endurance by constantly exerting yourself at full speed over and over again. I mean, it's so effective that now interval training, which training for football requires, is making it's way into boxing and mma. When running for either one, the routine is that there are times were you may be walking and others were you're sprinting at full speed instead of just jogging the whole time. I mean there was a post by Bible Belt I think were one of his buddies went to the military, had the best cardio in the world, but it hurt him fighting because he wasn't used to being explosive. But, I've been on both sides so that's just my view. Whatever works for you though.