how long or far are you guys running? And at what type of pace, just a decent jog?
i always switch it up. i believe that whenever you do repetitive stuff for workouts, your body will eventually adapt and then you will just be wasting time. after years and years of being fat, the thing that worked best for me, was shit like an hour in the morning, pre meal, of cardio. one day i would do eliptical machine, the next fast walking, the next fast walk on high incline, the next bike, the next modmerate pace with high incline, the next no incline but 60/90, where you run for 60 seconds and then walk for 90 seconds. when i started doing that, and eating right (thats the most important part) i lst over 50 lbs. find out what works for you, never quit just because you are tired and never give up and you will be good.
also, i always shoot for at least 3 miles of whatever i am doing. and i never try to go under 3.5 mph for pace.