Here is what our cat Marvin usually does:
Right. Just lays there like a giant sloth.
But the other night, he decided to start exploring. He jumped on the fence from the deck, went onto the neighbor's roof, then jumped over to a small trailer behind their house:
He went from the trailer to the back fence, then onto our garage, then onto our roof. He walked from the back of the roof to the front, then stood there and meowed at us. I was a little worried, because of how fat and pathetic he is, that he wouldn't be able to get himself down, but he made it okay.
I think some of his energy from his old Almaden lizard-catching, fighting days came back to him, just for a little while.