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Link to newsround

Youngest person to run the entire length of the UK completes challenge

Marcus completing the run at John O'Groats The Hull Boy

Marcus ran the length of the UK to raise money for a mental health charity

A 17-year-old has become the youngest and the first person under 18 to run the length of the UK, from Land's End in Cornwall to John O'Groats in Scotland.

Marcus, known to his tens of thousands of followers on social media as 'The Hull Boy' set off on his challenge at the beginning of April.

Since then he has run nearly 840-miles and raised more than £100,000.

He described the challenge on his social media as "two of the most difficult but greatest months of my life".

Marcus running.The Hull Boy

Marcus only started running one year before he started the challenge

Marcus only began running a year ago, starting with a mile-a-day challenge that he began to raise money for mental health charity Mind.

On his latest challenge, running from Land's End to John O'Groats, he continued to raise money for Mind which he chose because he has suffered from poor mental health in the past.

Over the two months of running the length of the UK Marcus has had plenty of unforgettable moments.

From running alongside deer, to amazing sunrises and sunsets, to the slightly less fun memories- running through fields of nettles and enduring some very wet and windy weather.

But, no matter what happened he kept on running.

Marcus and his dad shown hugging.The Hull Boy

Marcus's dad met him at the finish line.

Marcus is also a young carer for his dad, who was one of the fans waiting for him at the finish line.

His challenge has also caught the attention of celebrities and on day four of the run he received a special message on social media site X.

Four time Olympic medal holder Sir Mo Farah posted a message to him saying "Keep going champ! Anything is possible", accompanying the post with applause emojis.