The only way to increase the size of your legs is to exercise them. There are no alternative remedies or home remedies or quick fix solutions to the problem of thin legs. To some extent, your body shape is genetically determined, but you can work with what you have and improve it. What is important is working at it - if you are serious about improving your legs, you need to start a regular exercise schedule. Walking is excellent exercise for the legs, and part of your schedule should include brisk walking, for at least 20 minutes a day. In addition, if you join a gym, you will be able to perform several exercises that focus on developing your leg muscles. I assume that the rest of your body is fine, and only your legs are thin, particularly your ankles, so you can spend more time on leg exercises; however, do not overdo it or neglect the rest of your body entirely.
While you are trying to build up your legs, you also need to eat appropriately. Don't make the mistake of stuffing yourself with fatty foods as some people do - what your body needs is protein to build muscle and carbohydrates as fuel for your workouts. Your diet needs to be well rounded, but you can give a little more importance to these two things.
answered by G M