He has already crossed deserts.
He's already bungee-jumped.
He's already scuba-dived.
He's already climbed mountains.
He's already mountain-biked.
He's already run* marathons.
He's already written* a lot of articles and a website.
He's already met* a lot of different people.
He's already given* a lot of radio interviews.

-> the document is a CV / resume of Ben. Maybe he wants to be an explorer.