For a start, remember the good old rope. You need every day to do one hundred double jump, but if you find this difficult, then don't overwhelm yourself, do what you can. Just increase the number of jumps each time, and you'll soon pump up their legs.
One of the most effective exercises is "pistols", it will involve almost all muscle groups of the legs. Stretching one leg forward and squat. Make twenty "pistol" on each leg every day, and in a few months your feet you don't recognize. So tighten the back and buttocks. If this exercise is hard to do, just squat without stretching the legs.
The next exercise that will help build up the feet of the girl's attacks. Stand up straight, if necessary, hold onto a chair for your balance. Bend the leg at the knee and hold it close to the chest, then take a small step forward. You need to make sure that the knee was not ahead of the foot. Then return the knee back to your chest. Doing this exercise ten times for one leg, repeat the same for another.
When you feel that now enough for heavier exercises to pump up the legs, then go to the gym. Many believe that to pump up the calf muscle is possible with just a barbell or weighting, and in fact this muscle is one of the most prominent, and if she's too skinny, she have to hide under jeans. Also in the gym you will have one loyal friend is a stationary bike. Neglected classes it is not necessary, because after a few miles a day on it will bring you to the desired inflated legs.