Try picking up a big smooth metal ball, vs. a ball of the same weight that has a handle. The one with the handle will be much easier, because you don’t have to waste any energy getting purchase on it. With the smooth ball, you have to press your hands hard against its sides, or it will slip.
If a person wants to make it hard for someone to pick them up, they can contort their body in such a way that they are more likely to slip out of a persons grasp. For instance, you might pick up a toddler under their armpits, and if they cooperate that’s very easy. But if they lift up their arms and start flopping around, now your “handle” is gone and also their wriggling makes it even harder to hold on to them.
In other words, they’re not actually heavier (how could they be), they’re just more slippery.
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