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I have it in my mind that I would like to substitute a significant portion of my training (at least for a few months) with cycling instead of running. I am (as a layman) aware that both of course build aerobic capacity. My question is, all things being equal, assuming 5-6 running days a week (of 1-1.5hr runs @ a 6-7 pace), if I substitute half of these or more for cycling (same time, 1-1.5hr), will it hurt my running ability?