Cross-Train Off 270 Calories
Ready to challenge your muscles to a triple-threat routine? Try a California fitness club owner's calorie-burning cardio challenge.
Cardio Challenge
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.
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