So for his stunt Saturday above the Charlotte Motor Speedway in North Carolina, Wallenda added a challenge: his sister.
Wallenda was joined by Lijana Wallenda, starting at the opposite end of the wire and meeting in the middle. When they crossed, Lijana crouched down so Nik could carefully step over her.
Nik Wallenda also performed at the NASCAR track in Charlotte last year.
Notable deaths of 2014 [PHOTOS]