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Does the Cardio 'Interference Effect' Really Slow Your Gains?

Cardio and strength training are both important to your fitness, a fact that I have always known but currently am unable to shut up about. I am mainly a strength training person (a weightlifter, to be specific), and for a long time I thought that lifting a lot was enough. But when I added more cardio to my routine, I saw my lifting improve. Cardio is good for you, who knew.