Definition
Exercise where your muscles contract and burn like crazy but nothing actually moves, making you look like you're frozen in an extremely uncomfortable position. These static holds build strength without changing muscle length, so you're basically flexing as hard as possible while staying perfectly still like a sweaty statue. Wall sits and planks are prime examples of this special kind of motionless torture.
Example Usage
My trainer made me hold an isometric squat for two minutes, and now I understand what it means to hate someone who's trying to help you.
Source: Exercise science terminology
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