Of course, you can exercise for half an hour every day, but you must make sure to exercise three times a week. Step by step, focus on feeling your body and stretch gently at the edge of your body limit. In a month or so, you will feel obvious physical progress, such as physical strength and better health.
Yoga is a lifelong exercise, which can help you sleep and stretch your muscles, and cultivate your gentle temperament.
However, if you want quick results, I suggest you use a good back. A friend of mine used this equipment to change bad habits such as hunchback.
I wish you success!