A la Rip Van Winkle
[He was lying perfectly still, and suddenly, a flash of light as the Speed Force lights up around him. When it's gone, Wally is five years older, with slightly broader features, shorter hair, and all of his previous injuries gone. Now he's got a few scratches and burns which are rapidly healing, and he's wearing his costume which is torn with the cowl down. He sits up abruptly with a scream]