Leg exercises help, bike machines can help, they helped with my thighs. I always had fat thighs but now they're toned nicely, and big. My advice is to start on an inner thigh workout. I use a machine where youput your legs onto a pad, select your weight and press your legs together. It's what i did to start off with. A step up machine is good for the backs of your thighs, so you see what im saying. Just find different ways to do your thighs and you'll be sorted in no time. Good luck