The Lauterbrunnen Valley is one of their favourite spots, but they love it not because of its carpet of wild flowers, rushing streams and snow-covered peaks soaring into the blue sky.
They love it because of its sheer, vertical cliff walls, rising 700m (2,300ft) and more from the valley floor.
Ellen Brennan, Wingsuit BASE jumper, spends her life pursuing her passion for air sports.
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