1.Flat stomach? 2. Which is better: stationary bike, or treadmill HELP!?

[sally]

k so im a 15 year old. 120 lbs. pretty skinny. my thighs are kinda fat. like not HUGE but i want them to have more muscles on the underside, and i want more muscle and lessss fat in my thigh/butt area lol. (mainly focusing on losing fat but muscle is desireable i guess) so basically... I do fencing but only twice a week, and idk exactly how good that is for excercise. ill ask that all in another quesiton but anyways... so another "problem" spot is my stomach. i dont have a fat stomach at all. it just has like access fat . i just want a strong flat stomach with NO fat covering it! at all. 6 pack would be nice if its not to intense lol...but n e ways i basically just want to lose fat in my thighs, butt, and stomach. everything else i am completely satisfied with. arms are skinny etc.. So ANY ADVICE???? I have searched online for hours trying to find the perfect solution for me specifically. i go to the gym once in a while but i cant always get myself there or i would go everyday. all i have access to at home is a long driveway, a treadmill and a stationary bike, and my mom doesnt like me going out anywhere alone. so PLEASE I NEED HELP! alsoooo i didnt know which is better exercise? stationary bike or treadmill???????????? if you kno, explain!!! how!!! and why!!. which helps lose more weight overall too. etc etc. PLEASEEEEE HELPP

[mommyof5]

Do a lot of sit-ups! Ride the bike and jog on the treadmill.