When Is It Okay to Tell Someone They're Doing Something Wrong in the Gym?

When Is It Okay to Tell Someone They're Doing Something Wrong in the Gym?

Here’s a topic that generated some spirited discussion in our call for gym etiquette questions: when is it okay to tell someone they’re exercising wrong?

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When Is It Okay to Tell Someone They're Doing Something Wrong in the Gym?
Source: Life Hacker