I've never been unfitter. But Tidal is worth the blisters and I'm determined to hike the full 25 miles, over Pen-y-ghent, Ingleborough and Whernside, each a decent climb in itself. It'll take around 12 hours on my feet. Hoping to come down slimmer, in the knowledge that I've raised a few quid for my favourite bunch of community organising, visionary campaigners for a fairer city and a better world. Please sponsor me as much or as little as you can afford - every penny really does count for a small organisation like Tidal operating on a shoestring.