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TheActiveTimes.com: 4 Worthless Exercises You Probably Do

Overrated: Pec Deck/Chest Fly

While research has found that the pec deck machine is a great way to build chest muscle, the fact is that this machine puts your shoulder joint in an extremely vulnerable position, as it simultaneously rotates and abducts, according to Matthews. While this is especially dangerous for those with shoulder problems, using this machine can also cause injury in otherwise healthy exercisers.

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