Isometric
An isometric muscle action produces force with little or no change in muscle length or joint position.
Isometric: a practical example
For example, you hold a position against a resistance instead of moving through repetitions.
Use it in your log
When you log your workout, keep this in mind: a timed hold needs a duration entry to describe it; a rep count alone may not be useful.
Next, use the workout log to keep names, weights and reps in one place. Then check your progress across sessions.
Related terms
These examples explain terms. They do not tell you what to lift. If you need help with a plan, ask a qualified trainer.
Updated October 22, 2026. For more context, read the ACSM training guide (2009). However, terms can vary by plan.