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Glossary / Training
Isotonic
A dynamic contraction in which the muscle changes length under load.
Short Definition
A dynamic contraction in which the muscle changes length under load.
Plain-English Explanation
Isotonic means a dynamic contraction in which the muscle changes length under load. In practice, it helps name how force, position, and motion show up in exercise.
No Lies Lifting uses it as a plain-language reference point, not a magic rule by itself. Often used loosely in gym talk.