One in four people in the UK experience a mental health problem, yet despite being so widespread, people rarely talk openly or candidly about it. For those who have these difficulties, this stigma can exacerbate their situation and make it harder to recover.

In this two-part series, a group of ten unlikely runners living with or affected by different mental health issues train for the ultimate test of mind over matter. They’ll compete in one of the world’s most famous endurance races – the 2017 London Marathon.

Other stories:

• https://mobile.twitter.com/BBCBreakfast/status/854587996422713348/video/1
• https://mobile.twitter.com/mentalhealth/status/861875474749902848/video/1

Personal films:

• Jake: https://www.facebook.com/bbcthree/videos/10154704283020787/
• Poppy: https://www.facebook.com/bbcthree/videos/10154723725210787/
• Nick and Claudia: http://www.bbc.co.uk/programmes/p05171ct