The Offa's Dyke Path is a trail which goes from the sedbury cliffs in Chepstow, right through the border of England and Wales, to Prestatyn.

It's177 miles in length and has over 9,500 m of climbing in total.

Jack's aiming to do the whole thing in one go, in 2.5 days.

All in aid of accomplishing a personal goal, and raising money for the Royal British Legion