Thank you Riet.
Yes, I tried many times to sit in such a 'Lotus position'. But that was because of a promise my twin brother and I made in 1947. The story is as follows.
We were just back from Indonesia and we were a bit spoiled by our aunts and uncles. One of these uncles challenged us to sit in the above way and to rise to standing position without using your hands and keeping your feet crossed. The reward was a 'rijksdaalder', at the time a considerable amount of money! At the age of 8 and just coming back from a tropical country where you usually sit like that on the floor, it was not a problem. But our uncle had a second condition, we should keep that flexibility our whole life. Of course, we made that promised!
When our daughters were about the age of 8 years I challenged them likewise, now the reward was 10 guilders. They had no problem either to accept the challenge! But each time I ask them to demonstrate the Lotus exercise, I have to do the same. The last time I manage to do it was at the age of 65, but I had great difficulties to rise again. So I declared that I was now retired and from now on I was only required to sit down in a Lotus position. That would also apply to the promise our 3 daughters made. Afterall, at the time of the promise in 1947 people were not expected to become so old!