There are a variety of reasons why people may feel good after practicing yoga. Some of the potential benefits of yoga include:

1. Stress reduction: Yoga involves deep breathing, physical postures, and meditation, which can help to relax the body and mind. This can lead to a reduction in stress and an overall sense of well-being.
2. Improved flexibility: Yoga involves a range of physical postures that can help to increase flexibility in the muscles and joints. This can help to improve mobility and reduce stiffness and discomfort.
3. Improved strength: While yoga is often thought of as a form of low-impact exercise, it can also help to build strength in the muscles. This can be particularly beneficial for people who may not be able to engage in more high-impact forms of exercise.
4. Improved balance: Many yoga postures involve balancing on one foot or in unusual positions. This can help to improve balance and coordination.
5. Improved sleep: The relaxation techniques used in yoga can help to promote better sleep, which can lead to a more rested and refreshed feeling.
6. Improved cardiovascular health: Some forms of yoga, such as Vinyasa flow, can be more physically demanding and can provide a cardiovascular workout. This can help to improve heart health and reduce the risk of heart disease.

In summary, yoga can provide a range of physical and mental health benefits, including stress reduction, improved flexibility and strength, improved balance, improved sleep, and improved cardiovascular health. These factors may contribute to why people feel good after practicing yoga.