Swing out, turn around and swing back to the platform. A (close) friend on the platform stands in the middle and braces themselves against the platform supports. Depending on your height they may need to crouch. Swing up and wrap your legs around their neck. You can then unwrap your legs to start swinging again (and perhaps go back to make another catch).
You can find out more about this trick in my books:
Thanks to Susan for inventing and naming this trick.