Tai Chi and Baduanjin
Here is your direct link to free, no ads, nothing for sale Tai Chi and Baduanjin online classes.
The site link includes Tai Chi Simplified 8 (30 day practice - an introduction), a demonstration on Yang Style 24, 8 Brocades Qigong and 5 Element Gigong. Talk to your physician, get his/her approval to start an exercise program before you begin, then try it out. Most lessons are 15-30 minutes. All links are free to anyone via YouTube, but bcalmbzen researched many, found some of the best, and put them in one place for ease of access.
Although tai chi is generally safe, women who are pregnant or people with joint problems, back pain, fractures, severe osteoporosis or a hernia should consult their health care provider before trying tai chi. Modification or avoidance of certain postures may be recommended...Although you can rent or buy videos and books about tai chi, consider seeking guidance from a qualified tai chi instructor to gain the full benefits and learn proper techniques. - Mayo Clinic.
The 24-posture Simplified Form of t'ai chi ch'uan, sometimes called the Beijing or Peking form for its place of origin, is a short version of Taiji composed of twenty-four unique movements. - Wikipedia
In contrast, Tai chi, short for T'ai chi ch'üan, sometimes called "shadowboxing", is an internal Chinese martial art practiced for defense training, health benefits, and meditation. Wikipedia
The Baduanjin qigong(八段錦) is one of the most common forms of Chinese qigong used as exercise.  Variously translated as Eight Pieces of Brocade, Eight-Section Brocade, Eight Silken Movements or Eight Silk Weaving, the name of the form generally refers to how the eight individual movements of the form characterize and impart a silken quality (like that of a piece of brocade) to the body and its energy. The Baduanjin is primarily designated as a form of medical qigong, meant to improve health. This is in contrast to religious or martial forms of qigong. - Wikipedia.
Qigong, qi gong, chi kung, chi 'ung, or chi gung is a system of coordinated body-posture and movement, breathing, and meditation used for the purposes of health, spirituality, and martial-arts training. - Wikipedia
A tai chi instructor can teach you specific positions and breathing techniques. An instructor can also teach you how to practice tai chi safely, especially if you have injuries, chronic conditions, or balance or coordination problems. Although tai chi is slow and gentle, and generally doesn't have negative side effects, it may be possible to get injured if you don't use the proper techniques.
After learning tai chi, you may eventually feel confident enough to do tai chi on your own. But if you enjoy the social aspects of a class, consider continuing with group tai chi classes.
While you may gain some benefit from a tai chi class that lasts 12 weeks or less, you may enjoy greater benefits if you continue tai chi for the long term and become more skilled.
You may find it helpful to practice tai chi in the same place and at the same time every day to develop a routine. But if your schedule is erratic, do tai chi whenever you have a few minutes. You can even practice the soothing mind-body concepts of tai chi without performing the actual movements when you are in a stressful situation, such as a traffic jam or a tense work meeting, for instance. - Mayo Clinic https://www.mayoclinic.org/healthy-lifestyle/stress-management/in-depth/tai-chi/art-20045184