My muscles are not sore after a workout. Am I working out hard enough?

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"My muscles are not sore after a workout. Am I working out hard enough?," Examine.com, published on 2 October 2012, last updated on 22 October 2018, https://examine.com/nutrition/my-muscles-are-not-sore-after-a-workout-am-i-working-out-hard-enough/