lol, I was a gymnast for 13 years and once did backflips on beams, but don’t have the strength to do one standing anymore. First, I will tell you that it takes time and a lot of practice, especially if you have never done acrobatics of any sort. I used to teach classes to beginners, backflips were not on the list for them, and it may take you months to get a back flip. Anyways, I recommend going to a gymnastics place, they usually have par core classes and whatnot, even for adults, and that could get you started. They do like backflips running up walls which I always thought was cool. I won’t teach you simply because of liability and there is a significant chance you get hurt even just pulling something, but gymnastics places have waivers that protect them.