A personal trainer works his way across the rock-fill at the base of Hoover Dam using a medicine ball to shift his center of gravity as he works for core strength and for balance. My Final Photo for July 7, 2019.

Core Training And Balance – A personal trainer works his way across the rock-fill at the base of Hoover Dam using a medicine ball to shift his center of gravity as he works for core strength and for balance. My Final Photo for July 7, 2019.