One of many health benefits of yoga is for removing toxins from your body. While practicing yoga detox,every part of the body is pushed, pulled, twisted, turned and upended. These movements will help removing waste products such as carbon dioxide, lactic acid and lymphatic fluid from the deep tissues and extremities from your body.
Maricyasana and legs over the head are the most simple move you can practice. See the instruction in Yoga Detox.