Captains set off on their climb.
The former greats will be accompanied by 15 members of the public, including the Echo's own Madeleine Brindley, who will be blogging on our Walesonline website about the adventure.
The team includes Ieuan Evans, Scott Quinnell, Rob Howley, Eddie Butler and Colin Charvis. Collectively they aim to raise pounds 1m for Velindre Cancer Centre in Cardiff.
The Captain's Climb was organised by sport photographer Huw Evans, whose family has been affected by lung cancer.
Speaking at the Vale Hotel, Hensol, Mr Evans said the trip would be a lot of fun although, ultimately, the aim is to raise as much money as possible.
"At the end of the day we've got to get this money and get the research going. It's not just smoking related. People get lung cancer who have never smoked. It's the biggest killer in Wales and we've got to stop it.
"If everyone in Wales donated a pound we'd hit all our targets, so please get behind it."
To sponsor the captains visit www.velindrefundraising.
com or sponsor Madeleine by visiting www.justgiving.com/madeleine-brindley. You can also keep up to date with news about the climb and training at http://blogs.walesonline.
Rob Jones signs Bleddyn Bowen's shirt as the pair prepare to leave the Vale Hotel for Heathrow