The link worked for me... Try this one. It looks painful, although the baby doesn't look too unhappy, to be fair. My very rusty russian skills say that the heading is "baby yoga - Plato and Lena". The site itself seems to be a russian version of youtube. The video description says (according to google translator, since my knowledge failed me here):
Dynamic Gymnastics ... Watching some unimaginable acrobatics with newborns and babies, natural to wonder what the point of this manipulation? As far as they are needed, useful, dangerous, all are compatible with health? What are the consequences? ... And if everything is OK