All my teachers can make these amazing finger movements which they call (translated to english) wave fingers or wavy fingers. Without really moving their wrists or bending the fingers they just make a wavy motion. I guess it's a very common move, but I just can't get it to work. My arms are graceful and my hands are usually quite good but my fingers are just stiff in this move. I practise all the time and try to find the right muscles and technique but no result . Any tips on this would be most welcome! Thanks a lot!