Ultra-Trail Snowdonia-Eryri: 'I don't know if I can finish a race like this'

Competitors describe the challenge of the ultra trail races taking place in Eryri, also known as Snowdonia, over the coming days.

The Ultra-Trail Snowdonia-Eryri is the United Kingdom's only Ultra Trail du Mont Blanc (UTMB) World Series event and takes place on 12-14 May.

There are four routes, held over 100 miles (168km), 100km, 55km and 25km, which all start in the Welsh village of Llanberis.