Sharma , one of the world 's top boulderers , is thoughtful , and acknowledges that climbers leave their mark on the land .
I manage to catch 22 - year - old rock star Chris Sharma on the phone .
rock star , rock star of the world 's top boulderers , is thoughtful , and acknowledges that climbers leave their mark on the land .
I manage to catch 22 - year - old rock star Chris Sharma on the phone .