Our runners are what make Running Down Dementia so special. Find out what drives our RDD Heroes to get their running shoes on, plus join up with other members of #TeamARUK and share your own experiences.
For Rachel and her 10-year-old daughter Zara, Running Down Dementia gave them something positive to focus on during the stress and heartbreak of coping with a loved one with dementia.
They took on the challenge in honour of Rachel's mum and Zara's grandmother, who has Alzheimer's disease.
Zara ran the full 100km, while Rachel managed an incredible 1,000km. The duo raised nearly £1,500 for life-changing dementia research.
Mum-of-two Cheryl has taken part in Running Down Dementia for the last two years, raising more than £2,000. She was not a runner when she first signed up for the challenge but was inspired to complete the 100km as her mum was diagnosed with Alzheimer's disease aged 64.
Cheryl completed the final kilometres at a parkrun on her 40th birthday with her mum at the finish line cheering her home. She's now a regular runner and last year ran 300km and also achieved her aims of completing a 10km race and doing a sub-30-minute 5km.
Emdad crossed the finish line of Running Down Dementia 2016 having raised more than £100 thanks to the following he created on social media. He used both his Twitter and Facebook accounts to promote his challenge and friends and family got behind his cause.
Emdad celebrated reaching 100km with a cup of tea!
The Poolsbrook parkrun Event Director is one of the top Running Down Dementia fundraisers, having raised more than £5,000 in two years.
Andy was inspired to raise money for dementia research as his mum Peggy, who died last year, had vascular dementia.
He completed 250km in the first year and more than doubled that last year.
He also got family and friends to suggest additional challenges, with the highlight being when the Birmingham City fan had to run 10km wearing an Aston Villa shirt.