Yoga for beginners is for people of all ages, shapes and sizes. You first start in Yoga as a beginner and move forward until you are an expert in this field.
In my opinion, I call it art as Yoga for beginners is a combination of exercises combined with meditation and because it's more than just running on a treadmill or lifting weights. If you want to get more information about yoga for beginners, then you can browse https://credoyoga.com/yoga-for-beginners.
Actually the exercises related to Yoga are not in the traditional modern sense, you don't need to go to the gym but I would suggest that you beginners go to instructors who are qualified to get started.
Exercise involves posture and balance plus controlled breathing as opposed to strength and speed or aerobic type training in other disciplines.
It is important for me to point out the fact that there are many types of Yoga out there. They all have the same goal in mind and that is to improve the mind, body, and soul. Some emphasize differences in key areas such as meditation, nutrition or exercise.
The most common form in the Western world is Hatha Yoga. This has happened because it is the most applicable for our western culture and Westerners get along with the methods involved.
I would suggest before starting Yoga you briefly investigate different types and choose the one that best fits your lifestyle.