You have a thin waist and long arms. Besides, you need good flexibility. If you are flexible enough, even if your waist is not so thin and your arms are a little longer, you can touch your navel with your backhand. But even if you are not very flexible, as long as your waist is thin, it is the so-called A4 waist, and you can touch your hands and feet.

When I was in college, the boyfriend of a girl in our dormitory belonged to the kind of guy who was born thin, and the boy had long hands and feet. Plus his waist is thin, and his backhand can touch his navel. The girl in our dormitory told us that her boyfriend's flexibility is not so good, even worse than her, but my roommate just can't touch it. Therefore, if you want to touch your navel backhand, you really need a thin waist. In addition to a thin waist, your arms should be long. Otherwise, I guess it's very difficult to touch the navel with backhand.

Not long ago, we often saw some videos of backhand touching the navel on the Internet. People in the video all have a common feature, that is, thin and thin waist. You must have never seen 120 kilograms of people give you a backhand touch of the navel.

There is another question of flexibility that I mentioned. Some people, even if you are thin, but their arms are not long enough, flexible enough, and especially hard, you can't touch them. During the period when backhand touching navel was popular, I had a friend who was very thin. One day, we began to discuss who can touch the navel backhand. As far as I know, thin people can generally touch it, but the final result is almost the same. The reason is that she is inflexible and short, and her arms are not long, so it is normal not to touch.

Therefore, if you want to touch the navel backhand, you must first have a thin waist and long arms, and then be soft. As long as you can meet these three points, you can generally touch your navel with your backhand.