Definition
Exercise focusing on the lengthening phase of muscle contraction, where you fight gravity (like lowering a weight). Technically the hardest phase, though it looks like you're just being lazy.
Example Usage
Eccentric squats—where I lower the barbell for 3 seconds—absolutely destroy me, but they build strength effectively.
Origin
Biomechanics terminology; popularized in strength training during the 1980s-1990s.
Fun Fact
Eccentric exercise causes more DOMS and produces greater strength gains per unit of effort than concentric training.
Source: Biomechanics and strength training research
Related Terms
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