Sport Relief: BBC NI presenters and guests running for BBC Radio Around The World
BBC Radio Ulster and guests are pushing themselves to the limit as they take part in the BBC Radio Around The World event for Sport Relief later.
The aim is to run, swim and cycle 25,000 miles - equivalent to the circumference of the world.
BBC Sport NI's Joel Taggart will be at the helm as a host of other BBC Northern Ireland presenters join him on a treadmill in BBC Broadcasting House.
Presenters include Hugo Duncan, Gerry Kelly and Wendy Austin.
Northern Ireland sports stars expected to call in to give Joel a bit of encouragement - and maybe get on the treadmill themselves.
They include golfer Michael Hoey, footballer David Healy, boxer Brian Magee and snooker player, Mark Allen.
The BBC Radio Around the World for Sport Relief kicked off on 17 March as Radio 1's Nick Grimshaw took on a 12-hour cycle in a large, transparent box outside BBC Broadcasting House, London, in a bid to rack up 1,000 miles towards the 25,000 total.
Radio 2's Jo Whiley took on an even more brutal assignment of her own, running for a full 26 hours on a treadmill in the transparent box on Wednesday 19 March .
Throughout the rest of the UK, presenters, guests and listeners from BBC Radio Wales, BBC Radio Scotland and local BBC radio across England will be totting up the miles on treadmills, bikes, and in pools across the UK as they work towards reaching the grand total.
Since 2002, Sport Relief has raised more than £195m for charity.
The money raised by the public is spent by Comic Relief to help people in need both in the UK and across the world.
The public can choose to run, swim or cycle at the Sport Relief Games, from 21 - 23 March.
Anyone wanting more information or to sign up, can visit the Sport Relief website.