you have to be careful with it. over training is an issue. . but i'm in the military and run alot. .

you can do cardio, just make sure you don't over do it, and also plan your meals or even take some aminos so that you aren't doing empty stomach cardio or post work out cardio. . if you are trying to lose weight by doing cardio stick to non impact cardio.. but look more at your diet.

i feel the better your body works in all areas the stronger you can be. but you can't add tons of cardio without taking a look at your work out as a whole and diet.