The CMS, or the Centers for Medicare & Medicaid Services.
CMS website: https://www.cms.gov
The answer you are seeking is True.
This lets you know that your actual workout has just begun.
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In other times it's depending on what type of pain. You know when the pain is telling you to stop & you know when pain is building muscle.
I really hope that this is helping you greatly :) , have a nice day.