Why all characters' arms/legs in Adventure Time are so soft

How can they be so long and soft and even make arms waves? Have they not got any bones? The dog Jake has magic, so it's no problem that he has soft legs, but it doesn't make sense that Finn has soft

I think Finn might lose his arm soon(Adventure Time) - Off-Topic

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Why all characters' arms/legs in Adventure Time are so soft

PB's legs got bigger in the most recent episode : r/adventuretime

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