He + [climb]
He was climbing in the mountains.
We + [ride]
We were riding a camel in the desert.
You + [pick]
You were picking mushrooms in the forest.
She + [swim]
She was swimming in the lake / river.
I + [run]
I was running in fields.
She + [study wildlife]
She was studying wildlife in the jungle.
They + [have]
They were having a picnic in the park.
They + [jump down]
They were jumping down from a cliff.