When increasing physical acitivity towards a goal (training for a race: 5k, 10k, and half-marathon), is it better to increase mileage over time or increase my minutes over time? I know that mentally I prefer setting a timer and running until it ends, but is it bad that I don't know how far I am running? Will it hurt me in the end if I'm just running and not working on a set pace (minutes per mile)?
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