In the past, I've undertaken a number of successful fitness and fat loss challenges. I've taken all the pre-workout in the world, done thousands of kettlebell swings, gone paleo. But Sharkman's request got me thinking: What is the least amount of effort necessary for substantial weight loss? Can you get real results by just kind of messing around? So in our group chat, Sharkman and a few other friends made a commitment to walking 10,000 steps a day and tracking our food. We aimed for about 2,000 calories. Sharkman dubbed the initiative Health Zone. After four months following those guidelines, my friend dropped 43 pounds. Collectively the group chat was down 105. Those are life-changing, infomercial-pitch numbers. Some caveats obviously apply: losing weight is hard, and keeping it off is even harder. Your mileage will almost certainly vary. But the whole experience made me wonder: just how fit can you get from just walking ?