An official website of the United States government
Here's how you know
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Obstacle crossing experimental setup. Participants began obstacle trials at the far end of the carpet facing the wooden dowel. They crossed three obstacle heights created by fitting the dowel into corresponding holes in each tower.