system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is dead weight (unconscious person) so heavy when the person's weight doesn't change?
gpt
When a person is alive and with-it, they "participate" in being held by making sure weight is distributed to your core.  Getting a floppy body to have its weight distributed to your core muscles is hard and this makes balancing difficult and causes you to engage relatively weak muscles.