[Tsagadai]

A 360 on a children's swing can definitely be done. I've done it as a child and as an adult. It usually needs to have a much longer rope/chain on it to get the momentum up.

[Doxin]

Wouldn't you be limited to going 180 degrees? any more than that and you'll start falling straight down on the backswing instead of swinging.

[glaurung_]

You're definitely right. I wonder if he's thinking of jumping off of the swing and doing a 360 in the air.

Apparently it can be done if your swing has rigid bars in stead of ropes: https://m.youtube.com/watch?v=6KvBn7QvzaI