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Switching between different cardio machines during your workout can burn extra calories and challenge your muscles more than trudging along on the same piece of equipment the whole time. Try this cross-training routine from Todd Durkin, owner of Fitness Quest 10 in San Diego, California.
*RPE, or rate of perceived exertion, based on a scale of 1 to 10, 10 being the most work. Adjust speed or level to reach desired RPE.
Originally published in Fitness magazine, March 2006.