I do yoga a few times a week. If you really want to learn yoga, you can watch youtube videos, practice slowly and consistently and you will regain your flexibility with yoga. It is a good thing to first learn breathing techniques initially which is the key to doing yoga.
Yoga is a great choice if you're feeling tense and anxious. Thanks to some practice, I have been able to find harmony within myself, even though it seemed impossible to me before. My boss used to bug me at work that I was not supposed to do according to protocol. It was very stressful for me. One evening while I was mopping the floors in the office, I happened to come across a brochure of a yoga course near the table of one of my colleagues. This got me interested, and after buying everything I needed to start a yoga class like https://www.amazon.com/gp/product/B07K1RCTND?th=1, I began my journey. I strongly advise you to try the practices of Isha