Is there a secret or specific way on how to sit on the back of a bike without having to hold on and risk falling?

I noticed a lot of people that ride in the back of bikes don’t usually hold on to anything and seem to maintain their balance well. I always have to hold on to the back of the bike because I feel it’s basically my seatbelt. Is there some specific way on how to ride on the back of the bikes without having to hold on?

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