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.
(a) Starting position for the prone on ball with right hip extension and prone on ball with left hip extension. (b) Ending position for the prone on ball with right hip extension. (c) Ending position for the prone on ball with left hip extension.
