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Isometric Exercise Exercise involving an immovable object when muscle force is exerted against the immovable object and results in no body motion. Isotonic Exercise Exercise that uses a constant resistance, such as a barbell or dumbell, causing muscle force that exceeds the weight of the barbell or dumbell and causes joint motion. Isotonic means the weight or resistance stays the same --nothing fancy; however, the force on the muscle does really change because of variable positions of the body leverage and because of the angle of the pull of the muscle. One angled position of the lift can be quite effortless compared to another angle along the range of motion of the same lift.   HOME | Site Map | Center Stage | Our Solutions | Our Satisfied Clients | Fitness Topics PFP Newsletter | Company Profile | Contact Information | Help | Glossary | ?Mark | About the Author | Disclaimer ©Copyright 1999-2003 Apriori, Inc. All Rights Reserved. APRIORIATHLETICS and Progressive Fitness Personality are Service Marks of Apriori, Inc. All products mentioned are trademarks or registered trademarks of their respective owners.