Treadmills aren't necessarily bad. The problem most people have is when the incline is set to zero. Your running becomes more "bouncy". When using treadmills, you always want the incline to be at least a one or higher. I usually bump it up to two. When I have done that, I have noticed that my running off the treadmill is faster. Treadmills also help with pacing. once you set the speed, the treadmill kind of forces you to hold that pace if you leave the speed alone.
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