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Cycling Vs. Running — A Personal Trainer Runs Through the Best Form of Cardio

You want to get started on an actual cardio routine — one you’ll, you know, actually stick with for more than two days. But everyone gives you different advice. Some swear that treadmills will kill your muscles, but others promise that smart programming won’t put your hard-earned gains at risk. How do you sort out the noise? Here’s…