There's proteins that cause your skin to be more or less stretchy. E.g. bulldogs.
Bulldogs are inbred as fuck to get them to look the way they are, it's legitimate extra skin that grows over time, the presence of extra dermis comes along with the extra epidermis and a bunch of skin problems that occur in hot and humid climates.
I think the reason it looks weird is because it's on a black background, and you have no reference, so they're just bobbing about in the void. It will probably look a little more reasonable when you have a static reference like some sort of ground, or the like.
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More here.
Canoe polo is a thing I now love.