Isolation exercise
An isolation exercise focuses mainly on movement at one joint.
Isolation exercise: a practical example
For example, a leg extension primarily moves at the knee.
Use it in your log
When you log your workout, keep this in mind: other muscles may still stabilize you. Isolation does not mean only one muscle is active.
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.