He started by saying: “Off mountain biking in Wales (watching the rugby first of course!!)”
Just two hours later, Martin showed his bloodied leg covered with a large plaster and explained: “Already injured… and that was on the way from the car park to the uplift,” adding a crying with laughter emoji to make light of the injury.
He then told fans in a video: “You know they say, everyday you should do something that scares you a little bit…
“Well, I tell you what, I am completely out of my comfort zone here in a forest in Wales on what they call the easy slopes.”
Homes Under The Hammer airs weekdays at 10am on BBC One.