This January, Fiona will undertake her most extreme challenge yet: a 100-mile endurance race across the Sahara Desert.

Unlike other ultra-distance events that are broken into stages, this race is a single, continuous, self-supported effort with a strict 40-hour time limit. Fiona will face:

• Towering sand dunes

• Treacherous rocky climbs and descents

• Dried salt lakes

• Temperatures reaching 50°C by day and freezing conditions at night

• The ever-present risk of sandstorms

She is taking this on not just as a personal test, but to promote veganism and to raise vital funds to keep the sanctuary running through winter and beyond.