Definition
The actual challenging sets where you're using serious weight and trying to induce adaptation, as opposed to warm-up sets that are just rehearsals. Where the real work happens.
Example Usage
I did three warm-up sets and then five working sets of squats at 80% of my max, and that's where my legs turned to jelly.
Origin
Strength training programming distinguishing between preparatory and training sets
Fun Fact
Research suggests the first working set produces the most stimulus, with diminishing returns on subsequent sets—quality over quantity.
Source: Strength training and programming terminology
Related Terms
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