Okay, I am 13 years old and in the eighth grade. My calves are really big and I want to lose the fat off it! What type of cardio should i do? I know that running will make it bigger because it will gain muscle....I don't have any equipment except for a treadmill so what can I do? I'm trying to eat more healthier and i don't really do excercise now except for P.E. and the basketball team tryouts at my school. But i don't think that's really enough. so please help me!