An 81-year-old from Cumbria and his Geordie friend are over half way through their 950 mile cycle from Lands End to John O'Groats.
They're raising money for cancer care charities in Cumbria and South Shields. They're now cycling through the Scottish Borders.
Tony Rathbone started cycling after breaking both legs in an accident, 32 years ago. Now he's pushing them hard - he'll climb 50,000ft before the finish.
Day eight took them across the half-way point from South Cumbria to Tony's home town of Keswick.
Tony's cycling for Macmillan Cancer Care and the Friends of Keswick Hospital. Billy's riding for St Clare's Hospice in South Shields. Riding into Keswick was the most emotional part of the trip so far.
Day nine was much harder than day eight. The route took them into Carlisle for a brief radio interview before reaching the Scottish Borders at Gretna and cycling on up to Moffat.
They were expecting sun but woke up to rain. It made a huge difference to their mental energy.
But they're over half way now, crossing into Scotland.
You can find out more about their challenge at http://www.lejog.us.