See I do 50 squats,push ups, sit ups, and run 2 miles everyother day I am 13 only my legs and arm muscles improve no abdominal I've done this for 2 years. Suggestions?

Are you eating right? You've been doing the same thing for two years, which means that your body has hit a plateau... you need to keep increasing your routine and challenging your body so that it will start making more muscle.

Eating makes a HUGE difference in your workouts.

I eat regularly I increse it every 6 months

Nono, I mean what do you eat, how much of it do you eat? Also, your routine increases every 6 months? How so? Do you do more situps? It's time you mixed in different types of ab workouts like crunches, planks, leg raises, etc.

Thanks I just did what you said and I feel the dif I already have a 2 pack

Why are you not doing more sit ups if you have been doing 50 for a couple of years. Also add aditional exercise for those specific parts of you body.