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Because when we grab onto the handrails, we have a tendency to lean back. And people who do that burn significantly fewer calories. That’s because, when we walk up a real hill, we lean forward – which works our calf muscles, glutes and hamstrings. It also increases our calorie burn. If you grab on for dear life and lean back, you don’t get any of that. So, if you can’t let go, you either need to slow down or decrease the incline.