I was only really good at sprinting (or hurdling) as a runner, and I couldn't stand even very mild grades. It needed to be a flat and fast track. So with that in mind, I say running up hills is always harder. The only times I've been forced to walk my bike, the gradient was too steep for running. In fact, in cycling shoes and pushing up my pretty light road bike, walking was difficult. The grades were over 20%.



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