Greg Pain: How hard is too hard when pushing yourself in a workout?

Pushing yourself to your limit is kind of the whole point of exercise - running just a little longer when you're exhausted, doing that extra rep until you can't lift anymore.

But sometimes we miss warning signs, and push ourselves too hard - leading to an injury that even once fully recovered, most won't get back into the gym.

So how hard is too hard to push yourself?

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