hi, everybody. i am 20 yrs old 5'7" and 131 lbs. don't weigh that much but i feel like i'm really flabby. i am not really in shape yet, but i recently started running 3 miles on the treadmill about 4 times a week. i don't know anything about fitness, and my only problem area is the back of my thighs and my butt. i'm wondering if running is a good solution, how much i should be running, what other exercises should i combine it with, and any other suggestions you may have! i want to slim down my thighs and tighten my butt and i would love it if anyone has any good suggestions to help me with my running program! thanks!