Guy Martin has been forced to abandon his latest world record attempt, after sustaining an Achilles tendon injury.
The 35-year-old motorcycle racer and television personality was five days, and 800 miles into a 4,802-mile cycle around the British coastline when the injury forced him to cancel the record attempt.
In a statement on his website, he wrote that the injury on his left leg had occurred "after a day or so", but he had thought he could continue through it.
However, in order to avoid long-term damage, he decided to give up his challenge.
"I'm back at work and I realise I need to listen to my body more," he wrote.
"By just manning up I was papering over the cracks."
Martin had hoped to complete the journey in 20 days, beating the current record by two days.
This was the latest in a series of record attempts he has made in recent years. While he holds records for the fastest speed on a gravity-powered snow sled, fastest speed in a soapbox and highest speed on a wall of death, other attempts have not gone as well.
He failed at breaking the two-wheeled world land speed record in a purpose-built Triumph motorcycle this summer due to poor conditions and also cancelled a water speed world record using a human-powered hydrofoil because of weeds at Lincoln's Brayford Pool.
"I badly pulled my Achilles tendon on the left side after a day or so but thought I'd just get my head down and work through it. I kept good miles up and got to John O'Groats from Grimsby in 4 days and 8 hours, about 800 miles.
"But my leg was getting worse and I thought I could keep going and maybe do the whole lot in 30 days but I knew I'd be jiggered for a long time after and maybe even have serious long-term damage, which would mean I couldn't do the serious cycle trip I've got in my head for next year.
"So I've put my push bike back in the shed for the rest of the year, giving my leg a chance to recover. I'm back at work and I realise I need to listen to my body more. By just manning up I was papering over the cracks. Thanks very much for the support, loads of folk wishing me well and that was mega.
"It is what it is and like I said, "I've got to stop it before it stops me" and it did stop me."