The dog is not impressed
@Alessandro Mainente, in the exercises description it says "The knees will momentarily extend and straighten in the middle of the roll", which I am trying to do. It doesn't say anything about the arms. I am just noticing that my arms bend a little bit, while in the instruction video they are straight. Do the arms matter? Do you have any other tips, please? I would like to impress not just you but the dog too ;-)