Would you walk 10,000 steps a day with a heavy backpack on? ‘Rucking’ is the low-tech workout you need to try

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My backpack sloshed as I hiked up the hill. I was carrying a Cotopaxi bag with cross-body straps at the waist and chest, equipped with an additional 22lbs /10kgs of water contained in a plastic bladder – not the sort of load that would cause military personnel to break sweat, but this was my first time going for an organized 'ruck'. I reached the top of the hill, marked with a stone, and was greeted by some stunning views of the UK's Lake District. I was at the peak of Orrest Head, a small and accessible hill near Windermere, but...