The difficulty increases with the height of the frame, and the lowest is of course the lowest. But if it's just exercise, you can start with something simple. There is no strict requirement, it mainly depends on your perseverance. Of course, there are some physical problems. Abdominal muscle exercise is different from other muscles. Abdominal muscles belong to small muscle groups. Just like your calf muscles. It is not difficult to exercise. You can practice well with a little more strength. Mainly to constantly stimulate low weight and high frequency. For example, if you can do 60 sets at a time and 5 sets in a row, you can increase the height and difficulty. You can sign up for barbells to increase the difficulty.

If your abdominal muscles are never tired and your brain is tired, it means that your abdominal muscles are almost the same. When I first started doing it, I was over 20. No conditions. I just keep doing it in bed every day. Later, I can do it all at once. The key is persistence. I hope you can build good muscles. Hehe, well, don't forget to give points.