This YouTube video features a daring stunt. A man sits on top of a chair. And that chair is balanced on two legs on another chair. The whole setup sits on the edge of a 144-foot building.

Henri Rechatin is a world-renowned acrobat. He’s spent his life on the edge, literally. He is best known for high-wire acts across Niagara Falls. That’s where he met his wife. During a performance he asked for a volunteer to ride on his back. She came forward. They were soon married and performed together for many years.

This act was a solo effort. And it’s an impressive display of balance. More impressive is the fact that Rechatin is 66-years-old.