For this, first and foremost you will have to do plenty of warm-up exercises and several rounds of Surya Namaskar. Then make it a point to do all the Yoga poses in this sequence:

1. Standing Postures

2. Sitting Postures

3. Supine Postures

4. Prone Postures

5. Inverted Postures

6. Balancing Postures

Pay special attention to Twists in all the above postures such as Parivritta Trikonasana, Marichyasana, Ardha Matsyendrasana etc.

Also follow a Yoga Diet as far as possible. All these details you will easily find in this website itself if you search for them in the search box. You are bound to attain the figure you wish. All the best