My first caveat, if all you are doing is running you are not building muscle, you are burning muscle as well as any fat you may be burning. Second caveat, you can not out run a bad diet, nutrition takes the fat off not any form of exercise. Exercise improves our health and fitness but has at best a very limited effect on fat loss.
The ranked three part formula for fat loss is , in order, nutrition (diet), strength training and lastly cardio. The road to success is control your nutrition (diet), do strength training and add in some cardio.
It is called WORK-ing out for a reason.
I said getting fit was simple, I did not say it was easy.
Cardio burns calories, strength work burns fat.
Eat well to lose weight, exercise to get fit
You can not build a six pack using twelve packs
Often when we seek a magic bullet for fitness we end up shooting ourselves in the foot.
"I think calories are little germs in food that all moms are afraid of" Dennis the Menace