Sure. It does take some practice but It’s easy when you get the motion down. Essentially it’s all deception. If you watch the video again slow down the video to seen the frames. Because the way the camera is you would need to ease in and out when starting and ending. you need to keep increasing and decreasing their size. Every limb except the head and neck needs to be stretchy. You’ll find that you will still keep their limbs at around the same length. Also another great way to not get confused is to imagine the limbs as a different layer. Just start animating with stretchy limbs and slowly get more and more complicated. Other than that just keep practicing and you’ll get it in no time