Also a remark from my side. For me that excercise was also impossible at the begining. I was like: Now way! Human hand can't strech like that![br]But on all the videos it came so easy for experienced people so I forced myself.

First few days were hard but then it becomes easier and easier. Just don't treat it like something that you must master right away. Do it one or two times a day and it will become piece of cake.