The Midnight Mountain Marathon is no ordinary marathon.
Set in the breathtaking Brecon Beacons, the course takes you through forests, over streams, past waterfalls and up mountains.
The difference between this and any other mountain marathon, is that you start at 5.30PM and have to finish before the midnight cut off.
The Midnight Mountain Marathon uses part of the 'Fan Dance' which is the infamous run taken on by potential members of British Special Forces as part of their selection process.
This includes an ascent of Pen y Fan (2,907ft / 886m) which is the highest peak in South Wales.
There is now a half marathon available along with both half and full marathon bergen options. You can also enter as a team or pair.
Entry includes parking, a medal, T-shirt and hot soup at the finish.
Read a review by Sharon Bareham here.