Watch Massive Alpine Trundle in Seirra Nevada
Don't ever trundle rocks at popular areas or where others might be hiking

A video from Dan Cohen during the first ascent of Goodnight Irene on the north face of Mount Stewart in Sequoia National Park.
Trundling is the practice of clearing loose rocks from established or new routes. It’s discouraged at popular areas and places with hikers below for reasons of safety and environmental impact. However, high in the alpine where few people visit, it’s often the only way to make a new route safe for others to follow.