I've read that when they first land, the astronauts can't even walk. They have to be carried out of the capsule.

Could you imagine if suddenly, gravity was 3 or 4 times greater than it is now? Every movement would be exhausting.....balancing without falling would be difficult. I imagine that's how they feel at first.

But these astronauts quickly re-adapt to the gravity of Earth. The muscles, bones, and senses really want to be at our gravity....

I like how the guy that drops the cup and pen looks up and down for them, with no instinct that things fall to the floor.