For Ultra Runner Sally McRae, the biggest challenges pull her through the hardest times.

After a childhood loss changed her direction in life, Sally is now one of the world's toughest ultra runners competing on the UltraTrail World Tour. We followed her as she took part in the 2019 edition of the UltraTrail du Mont Blanc, a 107mile foot race described by many as the hardest trail race in the world.

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