I just saw the most amazing video.  A 13-year old girl climbs a huge rock-climbing wall that ends up bending and curving over an Olympic sized pool.  She has no harness or safety equipment.  If she loses her grip, she falls into the water. She’s a tiny thing.  From my vantage point, she doesn’t have huge muscles in her arms.  If I didn’t see her climbing with my own eyes, I probably wouldn’t have guessed that she was that strong.  While climbing, she frequently dips one hand at a time into a small pouch that is tied around her waist.  At first, I thought she was shaking her hands out…