Hello,
You want to know how to have firm buttocks all your life. You are right not to content with losing some kilos for summer, and gaining everything back from September. Besides, with some good habits taken from now, you will not need a diet.
According to the specialized magazines, forums and websites dedicated to the maintenance of a healthy body, it is recommended to move a lot. It is not about doing a high-level sport, but just having an active life: walking, staircases (two by two, on tiptoe!). Most of the time, avoiding the use of the car for small runs is very effective. About food, do not have a drastic diet which would decrease your consumption of proteins! You have to eat meat, eggs and fish. At the same time, reduce fats, without this you will keep a lot of cellulite.
But you should not forget to pamper your skin. Think about massaging with your washing glove under the shower, to remove dead skins. Hydrate with a cream. And do not forget the cold water jet! It is excellent to tone you up. But don’t go from warm to cold too fast, you risk to burst blood vessels.

Buy these photos from buttocks Dreamstime.com