Meaning of isotonic exercise

i'soton'ic ex'ercise

Pronunciation: [key]
  1. exercise or a program of exercises to increase muscular strength, power, and endurance based on lifting a constant amount of weight at variable speeds through a range of motion.
  2. any specific exercise of this type.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.