When you pick up a person, that person is helping you pick them
up. The gas cylinder can't help you.
.
Try this with a person, anyone who will cooperate and is a
reasonable weight that you can lift. First lift them normally as
you would any person. Then ask the person to lie limp as if dead,
and try to pick up that same person from the same position. You
will see the difference, how the person helped you the first
time.