I once decided it would be a cool idea to walk in straight line across England and began wondering how I would plan it. For some reason I noticed and realised my half way mark was a few meters away from this tree. As in if you look at a map the tree sits in the center of England where its diameter is at its narrowest - check it out. An odd thing. Looking at the topography from google maps and I remember thinking what…
Two of the most relevant are walking all across Wales in a straight line (which did involve trespass on some farms) and dribbling a soccer ball the entire length of the Hadrian's Wall path.
He calls these "straight line missions". Maybe it will inspire you to try some form of this sport, or maybe you'll just enjoy Tom's experiences.