Yoga is a practice that can promote good memory retention in several ways.

1. Improving focus and concentration: Yoga promotes focus and concentration by training the mind to stay present and not wander off. This can help to improve the ability to retain and retrieve information.
2. Reducing stress and anxiety: High levels of stress and anxiety can negatively impact memory retention. Yoga, through its physical and breathing practices, can help reduce these feelings and promote a sense of relaxation and well-being.
3. Enhancing blood flow: Yoga poses, such as inversions, can help to increase blood flow to the brain, which can improve oxygen and nutrient supply to the brain, promoting healthy brain function.
4. Activating the hippocampus: Yoga poses that involve balance, such as tree pose and eagle pose, have been shown to activate the hippocampus, a part of the brain that plays a key role in memory and spatial navigation.
5. Enhancing mindfulness: Yoga promotes mindfulness, the ability to pay attention to the present moment, which can help improve focus and concentration and in turn the ability to retain and retrieve information.
6. Improving sleep: Yoga can also improve sleep quality, which is crucial for memory consolidation and retrieval.

It is important to note that to see the benefits of yoga, it needs to be practiced regularly and in a consistent manner. And also, incorporating different types of yoga, such as Hatha, Vinyasa, and Kundalini, may have different effects on the brain and memory.

In summary, yoga promotes good memory retention through various ways such as improving focus and concentration, reducing stress and anxiety, enhancing blood flow, activating the hippocampus, enhancing mindfulness, and improving sleep quality.